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 __rcu       *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         struct timer_list               ip4_mc_router_timer;
 311         struct hlist_node               ip4_rlist;
 312 #if IS_ENABLED(CONFIG_IPV6)
 313         struct bridge_mcast_own_query   ip6_own_query;
 314         struct timer_list               ip6_mc_router_timer;
 315         struct hlist_node               ip6_rlist;
 316 #endif /* IS_ENABLED(CONFIG_IPV6) */
 317         u32                             multicast_eht_hosts_limit;
 318         u32                             multicast_eht_hosts_cnt;
 319         unsigned char                   multicast_router;
 320         struct bridge_mcast_stats       __percpu *mcast_stats;
 321         struct hlist_head               mglist;
 322 #endif
 323
 324 #ifdef CONFIG_SYSFS
 325         char                            sysfs_name[IFNAMSIZ];
 326 #endif
 327
 328 #ifdef CONFIG_NET_POLL_CONTROLLER
 329         struct netpoll                  *np;
 330 #endif
 331 #ifdef CONFIG_NET_SWITCHDEV
 332         int                             offload_fwd_mark;
 333 #endif
 334         u16                             group_fwd_mask;
 335         u16                             backup_redirected_cnt;
 336
 337         struct bridge_stp_xstats        stp_xstats;
 338 };
 339
 340 #define kobj_to_brport(obj)     container_of(obj, struct net_bridge_port, kobj)
 341
 342 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 343 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 344
 345 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 346 {
 347         return rcu_dereference(dev->rx_handler_data);
 348 }
 349
 350 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 351 {
 352         return netif_is_bridge_port(dev) ?
 353                 rtnl_dereference(dev->rx_handler_data) : NULL;
 354 }
 355
 356 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 357 {
 358         return netif_is_bridge_port(dev) ?
 359                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 360 }
 361
 362 enum net_bridge_opts {
 363         BROPT_VLAN_ENABLED,
 364         BROPT_VLAN_STATS_ENABLED,
 365         BROPT_NF_CALL_IPTABLES,
 366         BROPT_NF_CALL_IP6TABLES,
 367         BROPT_NF_CALL_ARPTABLES,
 368         BROPT_GROUP_ADDR_SET,
 369         BROPT_MULTICAST_ENABLED,
 370         BROPT_MULTICAST_QUERIER,
 371         BROPT_MULTICAST_QUERY_USE_IFADDR,
 372         BROPT_MULTICAST_STATS_ENABLED,
 373         BROPT_HAS_IPV6_ADDR,
 374         BROPT_NEIGH_SUPPRESS_ENABLED,
 375         BROPT_MTU_SET_BY_USER,
 376         BROPT_VLAN_STATS_PER_PORT,
 377         BROPT_NO_LL_LEARN,
 378         BROPT_VLAN_BRIDGE_BINDING,
 379 };
 380
 381 struct net_bridge {
 382         spinlock_t                      lock;
 383         spinlock_t                      hash_lock;
 384         struct hlist_head               frame_type_list;
 385         struct net_device               *dev;
 386         unsigned long                   options;
 387         /* These fields are accessed on each packet */
 388 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 389         __be16                          vlan_proto;
 390         u16                             default_pvid;
 391         struct net_bridge_vlan_group    __rcu *vlgrp;
 392 #endif
 393
 394         struct rhashtable               fdb_hash_tbl;
 395         struct list_head                port_list;
 396 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 397         union {
 398                 struct rtable           fake_rtable;
 399                 struct rt6_info         fake_rt6_info;
 400         };
 401 #endif
 402         u16                             group_fwd_mask;
 403         u16                             group_fwd_mask_required;
 404
 405         /* STP */
 406         bridge_id                       designated_root;
 407         bridge_id                       bridge_id;
 408         unsigned char                   topology_change;
 409         unsigned char                   topology_change_detected;
 410         u16                             root_port;
 411         unsigned long                   max_age;
 412         unsigned long                   hello_time;
 413         unsigned long                   forward_delay;
 414         unsigned long                   ageing_time;
 415         unsigned long                   bridge_max_age;
 416         unsigned long                   bridge_hello_time;
 417         unsigned long                   bridge_forward_delay;
 418         unsigned long                   bridge_ageing_time;
 419         u32                             root_path_cost;
 420
 421         u8                              group_addr[ETH_ALEN];
 422
 423         enum {
 424                 BR_NO_STP,              /* no spanning tree */
 425                 BR_KERNEL_STP,          /* old STP in kernel */
 426                 BR_USER_STP,            /* new RSTP in userspace */
 427         } stp_enabled;
 428
 429 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 430
 431         u32                             hash_max;
 432
 433         u32                             multicast_last_member_count;
 434         u32                             multicast_startup_query_count;
 435
 436         u8                              multicast_igmp_version;
 437         u8                              multicast_router;
 438 #if IS_ENABLED(CONFIG_IPV6)
 439         u8                              multicast_mld_version;
 440 #endif
 441         spinlock_t                      multicast_lock;
 442         unsigned long                   multicast_last_member_interval;
 443         unsigned long                   multicast_membership_interval;
 444         unsigned long                   multicast_querier_interval;
 445         unsigned long                   multicast_query_interval;
 446         unsigned long                   multicast_query_response_interval;
 447         unsigned long                   multicast_startup_query_interval;
 448
 449         struct rhashtable               mdb_hash_tbl;
 450         struct rhashtable               sg_port_tbl;
 451
 452         struct hlist_head               mcast_gc_list;
 453         struct hlist_head               mdb_list;
 454
 455         struct hlist_head               ip4_mc_router_list;
 456         struct timer_list               ip4_mc_router_timer;
 457         struct bridge_mcast_other_query ip4_other_query;
 458         struct bridge_mcast_own_query   ip4_own_query;
 459         struct bridge_mcast_querier     ip4_querier;
 460         struct bridge_mcast_stats       __percpu *mcast_stats;
 461 #if IS_ENABLED(CONFIG_IPV6)
 462         struct hlist_head               ip6_mc_router_list;
 463         struct timer_list               ip6_mc_router_timer;
 464         struct bridge_mcast_other_query ip6_other_query;
 465         struct bridge_mcast_own_query   ip6_own_query;
 466         struct bridge_mcast_querier     ip6_querier;
 467 #endif /* IS_ENABLED(CONFIG_IPV6) */
 468         struct work_struct              mcast_gc_work;
 469 #endif
 470
 471         struct timer_list               hello_timer;
 472         struct timer_list               tcn_timer;
 473         struct timer_list               topology_change_timer;
 474         struct delayed_work             gc_work;
 475         struct kobject                  *ifobj;
 476         u32                             auto_cnt;
 477
 478 #ifdef CONFIG_NET_SWITCHDEV
 479         int offload_fwd_mark;
 480 #endif
 481         struct hlist_head               fdb_list;
 482
 483 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 484         struct hlist_head               mrp_list;
 485 #endif
 486 #if IS_ENABLED(CONFIG_BRIDGE_CFM)
 487         struct hlist_head               mep_list;
 488 #endif
 489 };
 490
 491 struct br_input_skb_cb {
 492         struct net_device *brdev;
 493
 494         u16 frag_max_size;
 495 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 496         u8 igmp;
 497         u8 mrouters_only:1;
 498 #endif
 499         u8 proxyarp_replied:1;
 500         u8 src_port_isolated:1;
 501 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 502         u8 vlan_filtered:1;
 503 #endif
 504 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
 505         u8 br_netfilter_broute:1;
 506 #endif
 507
 508 #ifdef CONFIG_NET_SWITCHDEV
 509         int offload_fwd_mark;
 510 #endif
 511 };
 512
 513 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 514
 515 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 516 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 517 #else
 518 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 519 #endif
 520
 521 #define br_printk(level, br, format, args...)   \
 522         printk(level "%s: " format, (br)->dev->name, ##args)
 523
 524 #define br_err(__br, format, args...)                   \
 525         br_printk(KERN_ERR, __br, format, ##args)
 526 #define br_warn(__br, format, args...)                  \
 527         br_printk(KERN_WARNING, __br, format, ##args)
 528 #define br_notice(__br, format, args...)                \
 529         br_printk(KERN_NOTICE, __br, format, ##args)
 530 #define br_info(__br, format, args...)                  \
 531         br_printk(KERN_INFO, __br, format, ##args)
 532
 533 #define br_debug(br, format, args...)                   \
 534         pr_debug("%s: " format,  (br)->dev->name, ##args)
 535
 536 /* called under bridge lock */
 537 static inline int br_is_root_bridge(const struct net_bridge *br)
 538 {
 539         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 540 }
 541
 542 /* check if a VLAN entry is global */
 543 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 544 {
 545         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 546 }
 547
 548 /* check if a VLAN entry is used by the bridge */
 549 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 550 {
 551         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 552 }
 553
 554 /* check if we should use the vlan entry, returns false if it's only context */
 555 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 556 {
 557         if (br_vlan_is_master(v)) {
 558                 if (br_vlan_is_brentry(v))
 559                         return true;
 560                 else
 561                         return false;
 562         }
 563
 564         return true;
 565 }
 566
 567 static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
 568 {
 569         return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
 570 }
 571
 572 static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
 573 {
 574         bool ret = vid > 0 && vid < VLAN_VID_MASK;
 575
 576         if (!ret)
 577                 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
 578
 579         return ret;
 580 }
 581
 582 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
 583                                        const struct bridge_vlan_info *last,
 584                                        struct netlink_ext_ack *extack)
 585 {
 586         /* pvid flag is not allowed in ranges */
 587         if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
 588                 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
 589                 return false;
 590         }
 591
 592         /* when cur is the range end, check if:
 593          *  - it has range start flag
 594          *  - range ids are invalid (end is equal to or before start)
 595          */
 596         if (last) {
 597                 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 598                         NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
 599                         return false;
 600                 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
 601                         NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
 602                         return false;
 603                 } else if (cur->vid <= last->vid) {
 604                         NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
 605                         return false;
 606                 }
 607         }
 608
 609         /* check for required range flags */
 610         if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
 611                             BRIDGE_VLAN_INFO_RANGE_END))) {
 612                 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
 613                 return false;
 614         }
 615
 616         return true;
 617 }
 618
 619 static inline int br_afspec_cmd_to_rtm(int cmd)
 620 {
 621         switch (cmd) {
 622         case RTM_SETLINK:
 623                 return RTM_NEWVLAN;
 624         case RTM_DELLINK:
 625                 return RTM_DELVLAN;
 626         }
 627
 628         return 0;
 629 }
 630
 631 static inline int br_opt_get(const struct net_bridge *br,
 632                              enum net_bridge_opts opt)
 633 {
 634         return test_bit(opt, &br->options);
 635 }
 636
 637 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
 638                       struct netlink_ext_ack *extack);
 639 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
 640 int br_boolopt_multi_toggle(struct net_bridge *br,
 641                             struct br_boolopt_multi *bm,
 642                             struct netlink_ext_ack *extack);
 643 void br_boolopt_multi_get(const struct net_bridge *br,
 644                           struct br_boolopt_multi *bm);
 645 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
 646
 647 /* br_device.c */
 648 void br_dev_setup(struct net_device *dev);
 649 void br_dev_delete(struct net_device *dev, struct list_head *list);
 650 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 651 #ifdef CONFIG_NET_POLL_CONTROLLER
 652 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 653                                        struct sk_buff *skb)
 654 {
 655         netpoll_send_skb(p->np, skb);
 656 }
 657
 658 int br_netpoll_enable(struct net_bridge_port *p);
 659 void br_netpoll_disable(struct net_bridge_port *p);
 660 #else
 661 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 662                                        struct sk_buff *skb)
 663 {
 664 }
 665
 666 static inline int br_netpoll_enable(struct net_bridge_port *p)
 667 {
 668         return 0;
 669 }
 670
 671 static inline void br_netpoll_disable(struct net_bridge_port *p)
 672 {
 673 }
 674 #endif
 675
 676 /* br_fdb.c */
 677 int br_fdb_init(void);
 678 void br_fdb_fini(void);
 679 int br_fdb_hash_init(struct net_bridge *br);
 680 void br_fdb_hash_fini(struct net_bridge *br);
 681 void br_fdb_flush(struct net_bridge *br);
 682 void br_fdb_find_delete_local(struct net_bridge *br,
 683                               const struct net_bridge_port *p,
 684                               const unsigned char *addr, u16 vid);
 685 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 686 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 687 void br_fdb_cleanup(struct work_struct *work);
 688 void br_fdb_delete_by_port(struct net_bridge *br,
 689                            const struct net_bridge_port *p, u16 vid, int do_all);
 690 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 691                                              const unsigned char *addr,
 692                                              __u16 vid);
 693 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 694 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 695                    unsigned long off);
 696 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 697                   const unsigned char *addr, u16 vid);
 698 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 699                    const unsigned char *addr, u16 vid, unsigned long flags);
 700
 701 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 702                   struct net_device *dev, const unsigned char *addr, u16 vid);
 703 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 704                const unsigned char *addr, u16 vid, u16 nlh_flags,
 705                struct netlink_ext_ack *extack);
 706 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 707                 struct net_device *dev, struct net_device *fdev, int *idx);
 708 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
 709                const unsigned char *addr, u16 vid, u32 portid, u32 seq,
 710                struct netlink_ext_ack *extack);
 711 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 712 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 713 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 714                               const unsigned char *addr, u16 vid, bool is_local,
 715                               bool swdev_notify);
 716 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 717                               const unsigned char *addr, u16 vid,
 718                               bool swdev_notify);
 719 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 720                           const unsigned char *addr, u16 vid, bool offloaded);
 721
 722 /* br_forward.c */
 723 enum br_pkt_type {
 724         BR_PKT_UNICAST,
 725         BR_PKT_MULTICAST,
 726         BR_PKT_BROADCAST
 727 };
 728 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 729 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 730                 bool local_rcv, bool local_orig);
 731 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 732 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 733               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 734
 735 /* return true if both source port and dest port are isolated */
 736 static inline bool br_skb_isolated(const struct net_bridge_port *to,
 737                                    const struct sk_buff *skb)
 738 {
 739         return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
 740                (to->flags & BR_ISOLATED);
 741 }
 742
 743 /* br_if.c */
 744 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
 745 int br_add_bridge(struct net *net, const char *name);
 746 int br_del_bridge(struct net *net, const char *name);
 747 int br_add_if(struct net_bridge *br, struct net_device *dev,
 748               struct netlink_ext_ack *extack);
 749 int br_del_if(struct net_bridge *br, struct net_device *dev);
 750 void br_mtu_auto_adjust(struct net_bridge *br);
 751 netdev_features_t br_features_recompute(struct net_bridge *br,
 752                                         netdev_features_t features);
 753 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 754 void br_manage_promisc(struct net_bridge *br);
 755 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
 756
 757 /* br_input.c */
 758 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 759 rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
 760
 761 struct br_frame_type {
 762         __be16                  type;
 763         int                     (*frame_handler)(struct net_bridge_port *port,
 764                                                  struct sk_buff *skb);
 765         struct hlist_node       list;
 766 };
 767
 768 void br_add_frame(struct net_bridge *br, struct br_frame_type *ft);
 769 void br_del_frame(struct net_bridge *br, struct br_frame_type *ft);
 770
 771 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 772 {
 773         return rcu_dereference(dev->rx_handler) == br_get_rx_handler(dev);
 774 }
 775
 776 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
 777 {
 778         return rcu_dereference_rtnl(dev->rx_handler) == br_get_rx_handler(dev);
 779 }
 780
 781 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 782 {
 783         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 784 }
 785
 786 static inline struct net_bridge_port *
 787 br_port_get_check_rtnl(const struct net_device *dev)
 788 {
 789         return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
 790 }
 791
 792 /* br_ioctl.c */
 793 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 794 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 795                              void __user *arg);
 796
 797 /* br_multicast.c */
 798 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 799 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 800                      struct sk_buff *skb, u16 vid);
 801 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 802                                         struct sk_buff *skb, u16 vid);
 803 int br_multicast_add_port(struct net_bridge_port *port);
 804 void br_multicast_del_port(struct net_bridge_port *port);
 805 void br_multicast_enable_port(struct net_bridge_port *port);
 806 void br_multicast_disable_port(struct net_bridge_port *port);
 807 void br_multicast_init(struct net_bridge *br);
 808 void br_multicast_join_snoopers(struct net_bridge *br);
 809 void br_multicast_leave_snoopers(struct net_bridge *br);
 810 void br_multicast_open(struct net_bridge *br);
 811 void br_multicast_stop(struct net_bridge *br);
 812 void br_multicast_dev_del(struct net_bridge *br);
 813 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 814                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 815 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 816 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 817 int br_multicast_toggle(struct net_bridge *br, unsigned long val,
 818                         struct netlink_ext_ack *extack);
 819 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 820 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 821 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 822 #if IS_ENABLED(CONFIG_IPV6)
 823 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 824 #endif
 825 struct net_bridge_mdb_entry *
 826 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
 827 struct net_bridge_mdb_entry *
 828 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
 829 struct net_bridge_port_group *
 830 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 831                             struct net_bridge_port_group __rcu *next,
 832                             unsigned char flags, const unsigned char *src,
 833                             u8 filter_mode, u8 rt_protocol);
 834 int br_mdb_hash_init(struct net_bridge *br);
 835 void br_mdb_hash_fini(struct net_bridge *br);
 836 void br_mdb_notify(struct net_device *dev, struct net_bridge_mdb_entry *mp,
 837                    struct net_bridge_port_group *pg, int type);
 838 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 839                    int type);
 840 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
 841                          struct net_bridge_port_group *pg,
 842                          struct net_bridge_port_group __rcu **pp);
 843 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 844                         const struct sk_buff *skb, u8 type, u8 dir);
 845 int br_multicast_init_stats(struct net_bridge *br);
 846 void br_multicast_uninit_stats(struct net_bridge *br);
 847 void br_multicast_get_stats(const struct net_bridge *br,
 848                             const struct net_bridge_port *p,
 849                             struct br_mcast_stats *dest);
 850 void br_mdb_init(void);
 851 void br_mdb_uninit(void);
 852 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
 853 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
 854 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
 855                                      u8 filter_mode);
 856 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
 857                                        struct net_bridge_port_group *sg);
 858 struct net_bridge_group_src *
 859 br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip);
 860 void br_multicast_del_group_src(struct net_bridge_group_src *src,
 861                                 bool fastleave);
 862
 863 static inline bool br_group_is_l2(const struct br_ip *group)
 864 {
 865         return group->proto == 0;
 866 }
 867
 868 #define mlock_dereference(X, br) \
 869         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 870
 871 static inline struct hlist_node *
 872 br_multicast_get_first_rport_node(struct net_bridge *b, struct sk_buff *skb) {
 873 #if IS_ENABLED(CONFIG_IPV6)
 874         if (skb->protocol == htons(ETH_P_IPV6))
 875                 return rcu_dereference(hlist_first_rcu(&b->ip6_mc_router_list));
 876 #endif
 877         return rcu_dereference(hlist_first_rcu(&b->ip4_mc_router_list));
 878 }
 879
 880 static inline struct net_bridge_port *
 881 br_multicast_rport_from_node_skb(struct hlist_node *rp, struct sk_buff *skb) {
 882 #if IS_ENABLED(CONFIG_IPV6)
 883         if (skb->protocol == htons(ETH_P_IPV6))
 884                 return hlist_entry_safe(rp, struct net_bridge_port, ip6_rlist);
 885 #endif
 886         return hlist_entry_safe(rp, struct net_bridge_port, ip4_rlist);
 887 }
 888
 889 static inline bool br_ip4_multicast_is_router(struct net_bridge *br)
 890 {
 891         return timer_pending(&br->ip4_mc_router_timer);
 892 }
 893
 894 static inline bool br_ip6_multicast_is_router(struct net_bridge *br)
 895 {
 896 #if IS_ENABLED(CONFIG_IPV6)
 897         return timer_pending(&br->ip6_mc_router_timer);
 898 #else
 899         return false;
 900 #endif
 901 }
 902
 903 static inline bool
 904 br_multicast_is_router(struct net_bridge *br, struct sk_buff *skb)
 905 {
 906         switch (br->multicast_router) {
 907         case MDB_RTR_TYPE_PERM:
 908                 return true;
 909         case MDB_RTR_TYPE_TEMP_QUERY:
 910                 if (skb) {
 911                         if (skb->protocol == htons(ETH_P_IP))
 912                                 return br_ip4_multicast_is_router(br);
 913                         else if (skb->protocol == htons(ETH_P_IPV6))
 914                                 return br_ip6_multicast_is_router(br);
 915                 } else {
 916                         return br_ip4_multicast_is_router(br) ||
 917                                br_ip6_multicast_is_router(br);
 918                 }
 919                 fallthrough;
 920         default:
 921                 return false;
 922         }
 923 }
 924
 925 static inline bool
 926 __br_multicast_querier_exists(struct net_bridge *br,
 927                                 struct bridge_mcast_other_query *querier,
 928                                 const bool is_ipv6)
 929 {
 930         bool own_querier_enabled;
 931
 932         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
 933                 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
 934                         own_querier_enabled = false;
 935                 else
 936                         own_querier_enabled = true;
 937         } else {
 938                 own_querier_enabled = false;
 939         }
 940
 941         return time_is_before_jiffies(querier->delay_time) &&
 942                (own_querier_enabled || timer_pending(&querier->timer));
 943 }
 944
 945 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 946                                                struct ethhdr *eth,
 947                                                const struct net_bridge_mdb_entry *mdb)
 948 {
 949         switch (eth->h_proto) {
 950         case (htons(ETH_P_IP)):
 951                 return __br_multicast_querier_exists(br,
 952                         &br->ip4_other_query, false);
 953 #if IS_ENABLED(CONFIG_IPV6)
 954         case (htons(ETH_P_IPV6)):
 955                 return __br_multicast_querier_exists(br,
 956                         &br->ip6_other_query, true);
 957 #endif
 958         default:
 959                 return !!mdb && br_group_is_l2(&mdb->addr);
 960         }
 961 }
 962
 963 static inline bool br_multicast_is_star_g(const struct br_ip *ip)
 964 {
 965         switch (ip->proto) {
 966         case htons(ETH_P_IP):
 967                 return ipv4_is_zeronet(ip->src.ip4);
 968 #if IS_ENABLED(CONFIG_IPV6)
 969         case htons(ETH_P_IPV6):
 970                 return ipv6_addr_any(&ip->src.ip6);
 971 #endif
 972         default:
 973                 return false;
 974         }
 975 }
 976
 977 static inline bool br_multicast_should_handle_mode(const struct net_bridge *br,
 978                                                    __be16 proto)
 979 {
 980         switch (proto) {
 981         case htons(ETH_P_IP):
 982                 return !!(br->multicast_igmp_version == 3);
 983 #if IS_ENABLED(CONFIG_IPV6)
 984         case htons(ETH_P_IPV6):
 985                 return !!(br->multicast_mld_version == 2);
 986 #endif
 987         default:
 988                 return false;
 989         }
 990 }
 991
 992 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 993 {
 994         return BR_INPUT_SKB_CB(skb)->igmp;
 995 }
 996
 997 static inline unsigned long br_multicast_lmqt(const struct net_bridge *br)
 998 {
 999         return br->multicast_last_member_interval *
1000                br->multicast_last_member_count;
1001 }
1002
1003 static inline unsigned long br_multicast_gmi(const struct net_bridge *br)
1004 {
1005         /* use the RFC default of 2 for QRV */
1006         return 2 * br->multicast_query_interval +
1007                br->multicast_query_response_interval;
1008 }
1009 #else
1010 static inline int br_multicast_rcv(struct net_bridge *br,
1011                                    struct net_bridge_port *port,
1012                                    struct sk_buff *skb,
1013                                    u16 vid)
1014 {
1015         return 0;
1016 }
1017
1018 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
1019                                                       struct sk_buff *skb, u16 vid)
1020 {
1021         return NULL;
1022 }
1023
1024 static inline int br_multicast_add_port(struct net_bridge_port *port)
1025 {
1026         return 0;
1027 }
1028
1029 static inline void br_multicast_del_port(struct net_bridge_port *port)
1030 {
1031 }
1032
1033 static inline void br_multicast_enable_port(struct net_bridge_port *port)
1034 {
1035 }
1036
1037 static inline void br_multicast_disable_port(struct net_bridge_port *port)
1038 {
1039 }
1040
1041 static inline void br_multicast_init(struct net_bridge *br)
1042 {
1043 }
1044
1045 static inline void br_multicast_join_snoopers(struct net_bridge *br)
1046 {
1047 }
1048
1049 static inline void br_multicast_leave_snoopers(struct net_bridge *br)
1050 {
1051 }
1052
1053 static inline void br_multicast_open(struct net_bridge *br)
1054 {
1055 }
1056
1057 static inline void br_multicast_stop(struct net_bridge *br)
1058 {
1059 }
1060
1061 static inline void br_multicast_dev_del(struct net_bridge *br)
1062 {
1063 }
1064
1065 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
1066                                       struct sk_buff *skb,
1067                                       bool local_rcv, bool local_orig)
1068 {
1069 }
1070
1071 static inline bool br_multicast_is_router(struct net_bridge *br,
1072                                           struct sk_buff *skb)
1073 {
1074         return false;
1075 }
1076
1077 static inline bool br_multicast_querier_exists(struct net_bridge *br,
1078                                                struct ethhdr *eth,
1079                                                const struct net_bridge_mdb_entry *mdb)
1080 {
1081         return false;
1082 }
1083
1084 static inline void br_mdb_init(void)
1085 {
1086 }
1087
1088 static inline void br_mdb_uninit(void)
1089 {
1090 }
1091
1092 static inline int br_mdb_hash_init(struct net_bridge *br)
1093 {
1094         return 0;
1095 }
1096
1097 static inline void br_mdb_hash_fini(struct net_bridge *br)
1098 {
1099 }
1100
1101 static inline void br_multicast_count(struct net_bridge *br,
1102                                       const struct net_bridge_port *p,
1103                                       const struct sk_buff *skb,
1104                                       u8 type, u8 dir)
1105 {
1106 }
1107
1108 static inline int br_multicast_init_stats(struct net_bridge *br)
1109 {
1110         return 0;
1111 }
1112
1113 static inline void br_multicast_uninit_stats(struct net_bridge *br)
1114 {
1115 }
1116
1117 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
1118 {
1119         return 0;
1120 }
1121 #endif
1122
1123 /* br_vlan.c */
1124 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1125 bool br_allowed_ingress(const struct net_bridge *br,
1126                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
1127                         u16 *vid, u8 *state);
1128 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1129                        const struct sk_buff *skb);
1130 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
1131 struct sk_buff *br_handle_vlan(struct net_bridge *br,
1132                                const struct net_bridge_port *port,
1133                                struct net_bridge_vlan_group *vg,
1134                                struct sk_buff *skb);
1135 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1136                 bool *changed, struct netlink_ext_ack *extack);
1137 int br_vlan_delete(struct net_bridge *br, u16 vid);
1138 void br_vlan_flush(struct net_bridge *br);
1139 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
1140 void br_recalculate_fwd_mask(struct net_bridge *br);
1141 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val,
1142                           struct netlink_ext_ack *extack);
1143 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto,
1144                         struct netlink_ext_ack *extack);
1145 int br_vlan_set_proto(struct net_bridge *br, unsigned long val,
1146                       struct netlink_ext_ack *extack);
1147 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
1148 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
1149 int br_vlan_init(struct net_bridge *br);
1150 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val,
1151                              struct netlink_ext_ack *extack);
1152 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
1153                                struct netlink_ext_ack *extack);
1154 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1155                  bool *changed, struct netlink_ext_ack *extack);
1156 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
1157 void nbp_vlan_flush(struct net_bridge_port *port);
1158 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
1159 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
1160 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1161                        struct pcpu_sw_netstats *stats);
1162 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
1163 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
1164                          void *ptr);
1165 void br_vlan_rtnl_init(void);
1166 void br_vlan_rtnl_uninit(void);
1167 void br_vlan_notify(const struct net_bridge *br,
1168                     const struct net_bridge_port *p,
1169                     u16 vid, u16 vid_range,
1170                     int cmd);
1171 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1172                              const struct net_bridge_vlan *range_end);
1173
1174 void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
1175                                     struct net_device_path_ctx *ctx,
1176                                     struct net_device_path *path);
1177 int br_vlan_fill_forward_path_mode(struct net_bridge *br,
1178                                    struct net_bridge_port *dst,
1179                                    struct net_device_path *path);
1180
1181 static inline struct net_bridge_vlan_group *br_vlan_group(
1182                                         const struct net_bridge *br)
1183 {
1184         return rtnl_dereference(br->vlgrp);
1185 }
1186
1187 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1188                                         const struct net_bridge_port *p)
1189 {
1190         return rtnl_dereference(p->vlgrp);
1191 }
1192
1193 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1194                                         const struct net_bridge *br)
1195 {
1196         return rcu_dereference(br->vlgrp);
1197 }
1198
1199 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1200                                         const struct net_bridge_port *p)
1201 {
1202         return rcu_dereference(p->vlgrp);
1203 }
1204
1205 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1206  * skb, the vlan tag will always be present if the frame was tagged.
1207  */
1208 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1209 {
1210         int err = 0;
1211
1212         if (skb_vlan_tag_present(skb)) {
1213                 *vid = skb_vlan_tag_get_id(skb);
1214         } else {
1215                 *vid = 0;
1216                 err = -EINVAL;
1217         }
1218
1219         return err;
1220 }
1221
1222 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1223 {
1224         if (!vg)
1225                 return 0;
1226
1227         smp_rmb();
1228         return vg->pvid;
1229 }
1230
1231 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1232 {
1233         return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1234 }
1235 #else
1236 static inline bool br_allowed_ingress(const struct net_bridge *br,
1237                                       struct net_bridge_vlan_group *vg,
1238                                       struct sk_buff *skb,
1239                                       u16 *vid, u8 *state)
1240 {
1241         return true;
1242 }
1243
1244 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1245                                      const struct sk_buff *skb)
1246 {
1247         return true;
1248 }
1249
1250 static inline bool br_should_learn(struct net_bridge_port *p,
1251                                    struct sk_buff *skb, u16 *vid)
1252 {
1253         return true;
1254 }
1255
1256 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1257                                              const struct net_bridge_port *port,
1258                                              struct net_bridge_vlan_group *vg,
1259                                              struct sk_buff *skb)
1260 {
1261         return skb;
1262 }
1263
1264 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1265                               bool *changed, struct netlink_ext_ack *extack)
1266 {
1267         *changed = false;
1268         return -EOPNOTSUPP;
1269 }
1270
1271 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1272 {
1273         return -EOPNOTSUPP;
1274 }
1275
1276 static inline void br_vlan_flush(struct net_bridge *br)
1277 {
1278 }
1279
1280 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1281 {
1282 }
1283
1284 static inline int br_vlan_init(struct net_bridge *br)
1285 {
1286         return 0;
1287 }
1288
1289 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1290                                bool *changed, struct netlink_ext_ack *extack)
1291 {
1292         *changed = false;
1293         return -EOPNOTSUPP;
1294 }
1295
1296 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1297 {
1298         return -EOPNOTSUPP;
1299 }
1300
1301 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1302 {
1303 }
1304
1305 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1306                                                    u16 vid)
1307 {
1308         return NULL;
1309 }
1310
1311 static inline int nbp_vlan_init(struct net_bridge_port *port,
1312                                 struct netlink_ext_ack *extack)
1313 {
1314         return 0;
1315 }
1316
1317 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1318 {
1319         return 0;
1320 }
1321
1322 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1323 {
1324         return 0;
1325 }
1326
1327 static inline int br_vlan_filter_toggle(struct net_bridge *br,
1328                                         unsigned long val,
1329                                         struct netlink_ext_ack *extack)
1330 {
1331         return -EOPNOTSUPP;
1332 }
1333
1334 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1335                                          u32 filter_mask)
1336 {
1337         return 0;
1338 }
1339
1340 static inline void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
1341                                                   struct net_device_path_ctx *ctx,
1342                                                   struct net_device_path *path)
1343 {
1344 }
1345
1346 static inline int br_vlan_fill_forward_path_mode(struct net_bridge *br,
1347                                                  struct net_bridge_port *dst,
1348                                                  struct net_device_path *path)
1349 {
1350         return 0;
1351 }
1352
1353 static inline struct net_bridge_vlan_group *br_vlan_group(
1354                                         const struct net_bridge *br)
1355 {
1356         return NULL;
1357 }
1358
1359 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1360                                         const struct net_bridge_port *p)
1361 {
1362         return NULL;
1363 }
1364
1365 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1366                                         const struct net_bridge *br)
1367 {
1368         return NULL;
1369 }
1370
1371 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1372                                         const struct net_bridge_port *p)
1373 {
1374         return NULL;
1375 }
1376
1377 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1378                                      struct pcpu_sw_netstats *stats)
1379 {
1380 }
1381
1382 static inline void br_vlan_port_event(struct net_bridge_port *p,
1383                                       unsigned long event)
1384 {
1385 }
1386
1387 static inline int br_vlan_bridge_event(struct net_device *dev,
1388                                        unsigned long event, void *ptr)
1389 {
1390         return 0;
1391 }
1392
1393 static inline void br_vlan_rtnl_init(void)
1394 {
1395 }
1396
1397 static inline void br_vlan_rtnl_uninit(void)
1398 {
1399 }
1400
1401 static inline void br_vlan_notify(const struct net_bridge *br,
1402                                   const struct net_bridge_port *p,
1403                                   u16 vid, u16 vid_range,
1404                                   int cmd)
1405 {
1406 }
1407
1408 static inline bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1409                                            const struct net_bridge_vlan *range_end)
1410 {
1411         return true;
1412 }
1413 #endif
1414
1415 /* br_vlan_options.c */
1416 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1417 bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1418                            const struct net_bridge_vlan *range_end);
1419 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1420 size_t br_vlan_opts_nl_size(void);
1421 int br_vlan_process_options(const struct net_bridge *br,
1422                             const struct net_bridge_port *p,
1423                             struct net_bridge_vlan *range_start,
1424                             struct net_bridge_vlan *range_end,
1425                             struct nlattr **tb,
1426                             struct netlink_ext_ack *extack);
1427
1428 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1429 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1430 {
1431         return READ_ONCE(v->state);
1432 }
1433
1434 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1435 {
1436         WRITE_ONCE(v->state, state);
1437 }
1438
1439 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1440 {
1441         return READ_ONCE(vg->pvid_state);
1442 }
1443
1444 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1445                                           u8 state)
1446 {
1447         WRITE_ONCE(vg->pvid_state, state);
1448 }
1449
1450 /* learn_allow is true at ingress and false at egress */
1451 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1452 {
1453         switch (state) {
1454         case BR_STATE_LEARNING:
1455                 return learn_allow;
1456         case BR_STATE_FORWARDING:
1457                 return true;
1458         default:
1459                 return false;
1460         }
1461 }
1462 #endif
1463
1464 struct nf_br_ops {
1465         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1466 };
1467 extern const struct nf_br_ops __rcu *nf_br_ops;
1468
1469 /* br_netfilter.c */
1470 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1471 int br_nf_core_init(void);
1472 void br_nf_core_fini(void);
1473 void br_netfilter_rtable_init(struct net_bridge *);
1474 #else
1475 static inline int br_nf_core_init(void) { return 0; }
1476 static inline void br_nf_core_fini(void) {}
1477 #define br_netfilter_rtable_init(x)
1478 #endif
1479
1480 /* br_stp.c */
1481 void br_set_state(struct net_bridge_port *p, unsigned int state);
1482 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1483 void br_init_port(struct net_bridge_port *p);
1484 void br_become_designated_port(struct net_bridge_port *p);
1485
1486 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1487 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1488 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1489 int br_set_max_age(struct net_bridge *br, unsigned long x);
1490 int __set_ageing_time(struct net_device *dev, unsigned long t);
1491 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1492
1493
1494 /* br_stp_if.c */
1495 void br_stp_enable_bridge(struct net_bridge *br);
1496 void br_stp_disable_bridge(struct net_bridge *br);
1497 int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1498                        struct netlink_ext_ack *extack);
1499 void br_stp_enable_port(struct net_bridge_port *p);
1500 void br_stp_disable_port(struct net_bridge_port *p);
1501 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1502 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1503 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1504 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1505 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1506 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1507
1508 /* br_stp_bpdu.c */
1509 struct stp_proto;
1510 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1511                 struct net_device *dev);
1512
1513 /* br_stp_timer.c */
1514 void br_stp_timer_init(struct net_bridge *br);
1515 void br_stp_port_timer_init(struct net_bridge_port *p);
1516 unsigned long br_timer_value(const struct timer_list *timer);
1517
1518 /* br.c */
1519 #if IS_ENABLED(CONFIG_ATM_LANE)
1520 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1521 #endif
1522
1523 /* br_mrp.c */
1524 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
1525 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1526                  struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1527 bool br_mrp_enabled(struct net_bridge *br);
1528 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1529 int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br);
1530 #else
1531 static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1532                                struct nlattr *attr, int cmd,
1533                                struct netlink_ext_ack *extack)
1534 {
1535         return -EOPNOTSUPP;
1536 }
1537
1538 static inline bool br_mrp_enabled(struct net_bridge *br)
1539 {
1540         return false;
1541 }
1542
1543 static inline void br_mrp_port_del(struct net_bridge *br,
1544                                    struct net_bridge_port *p)
1545 {
1546 }
1547
1548 static inline int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br)
1549 {
1550         return 0;
1551 }
1552
1553 #endif
1554
1555 /* br_cfm.c */
1556 #if IS_ENABLED(CONFIG_BRIDGE_CFM)
1557 int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
1558                  struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1559 bool br_cfm_created(struct net_bridge *br);
1560 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *p);
1561 int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br);
1562 int br_cfm_status_fill_info(struct sk_buff *skb,
1563                             struct net_bridge *br,
1564                             bool getlink);
1565 int br_cfm_mep_count(struct net_bridge *br, u32 *count);
1566 int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count);
1567 #else
1568 static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
1569                                struct nlattr *attr, int cmd,
1570                                struct netlink_ext_ack *extack)
1571 {
1572         return -EOPNOTSUPP;
1573 }
1574
1575 static inline bool br_cfm_created(struct net_bridge *br)
1576 {
1577         return false;
1578 }
1579
1580 static inline void br_cfm_port_del(struct net_bridge *br,
1581                                    struct net_bridge_port *p)
1582 {
1583 }
1584
1585 static inline int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br)
1586 {
1587         return -EOPNOTSUPP;
1588 }
1589
1590 static inline int br_cfm_status_fill_info(struct sk_buff *skb,
1591                                           struct net_bridge *br,
1592                                           bool getlink)
1593 {
1594         return -EOPNOTSUPP;
1595 }
1596
1597 static inline int br_cfm_mep_count(struct net_bridge *br, u32 *count)
1598 {
1599         return -EOPNOTSUPP;
1600 }
1601
1602 static inline int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
1603 {
1604         return -EOPNOTSUPP;
1605 }
1606 #endif
1607
1608 /* br_netlink.c */
1609 extern struct rtnl_link_ops br_link_ops;
1610 int br_netlink_init(void);
1611 void br_netlink_fini(void);
1612 void br_ifinfo_notify(int event, const struct net_bridge *br,
1613                       const struct net_bridge_port *port);
1614 void br_info_notify(int event, const struct net_bridge *br,
1615                     const struct net_bridge_port *port, u32 filter);
1616 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1617                struct netlink_ext_ack *extack);
1618 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1619 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1620                u32 filter_mask, int nlflags);
1621 int br_process_vlan_info(struct net_bridge *br,
1622                          struct net_bridge_port *p, int cmd,
1623                          struct bridge_vlan_info *vinfo_curr,
1624                          struct bridge_vlan_info **vinfo_last,
1625                          bool *changed,
1626                          struct netlink_ext_ack *extack);
1627
1628 #ifdef CONFIG_SYSFS
1629 /* br_sysfs_if.c */
1630 extern const struct sysfs_ops brport_sysfs_ops;
1631 int br_sysfs_addif(struct net_bridge_port *p);
1632 int br_sysfs_renameif(struct net_bridge_port *p);
1633
1634 /* br_sysfs_br.c */
1635 int br_sysfs_addbr(struct net_device *dev);
1636 void br_sysfs_delbr(struct net_device *dev);
1637
1638 #else
1639
1640 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1641 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1642 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1643 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1644 #endif /* CONFIG_SYSFS */
1645
1646 /* br_switchdev.c */
1647 #ifdef CONFIG_NET_SWITCHDEV
1648 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1649 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1650                               struct sk_buff *skb);
1651 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1652                                   const struct sk_buff *skb);
1653 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1654                                unsigned long flags,
1655                                unsigned long mask,
1656                                struct netlink_ext_ack *extack);
1657 void br_switchdev_fdb_notify(struct net_bridge *br,
1658                              const struct net_bridge_fdb_entry *fdb, int type);
1659 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1660                                struct netlink_ext_ack *extack);
1661 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1662
1663 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1664 {
1665         skb->offload_fwd_mark = 0;
1666 }
1667 #else
1668 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1669 {
1670         return 0;
1671 }
1672
1673 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1674                                             struct sk_buff *skb)
1675 {
1676 }
1677
1678 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1679                                                 const struct sk_buff *skb)
1680 {
1681         return true;
1682 }
1683
1684 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1685                                              unsigned long flags,
1686                                              unsigned long mask,
1687                                              struct netlink_ext_ack *extack)
1688 {
1689         return 0;
1690 }
1691
1692 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1693                                              u16 vid, u16 flags,
1694                                              struct netlink_ext_ack *extack)
1695 {
1696         return -EOPNOTSUPP;
1697 }
1698
1699 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1700 {
1701         return -EOPNOTSUPP;
1702 }
1703
1704 static inline void
1705 br_switchdev_fdb_notify(struct net_bridge *br,
1706                         const struct net_bridge_fdb_entry *fdb, int type)
1707 {
1708 }
1709
1710 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1711 {
1712 }
1713 #endif /* CONFIG_NET_SWITCHDEV */
1714
1715 /* br_arp_nd_proxy.c */
1716 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1717 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1718                               u16 vid, struct net_bridge_port *p);
1719 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1720                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1721 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1722 #endif