net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <net/ip6_fib.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/rhashtable.h>
  24 #include <linux/refcount.h>
  25
  26 #define BR_HASH_BITS 8
  27 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  28
  29 #define BR_HOLD_TIME (1*HZ)
  30
  31 #define BR_PORT_BITS    10
  32 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  33
  34 #define BR_VERSION      "2.3"
  35
  36 /* Control of forwarding link local multicast */
  37 #define BR_GROUPFWD_DEFAULT     0
  38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  39 enum {
  40         BR_GROUPFWD_STP         = BIT(0),
  41         BR_GROUPFWD_MACPAUSE    = BIT(1),
  42         BR_GROUPFWD_LACP        = BIT(2),
  43 };
  44
  45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
  46                                 BR_GROUPFWD_LACP)
  47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  48 #define BR_GROUPFWD_8021AD      0xB801u
  49
  50 /* Path to usermode spanning tree program */
  51 #define BR_STP_PROG     "/sbin/bridge-stp"
  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 {
  59         unsigned char   prio[2];
  60         unsigned char   addr[ETH_ALEN];
  61 };
  62
  63 struct mac_addr
  64 {
  65         unsigned char   addr[ETH_ALEN];
  66 };
  67
  68 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  69 /* our own querier */
  70 struct bridge_mcast_own_query {
  71         struct timer_list       timer;
  72         u32                     startup_sent;
  73 };
  74
  75 /* other querier */
  76 struct bridge_mcast_other_query {
  77         struct timer_list               timer;
  78         unsigned long                   delay_time;
  79 };
  80
  81 /* selected querier */
  82 struct bridge_mcast_querier {
  83         struct br_ip addr;
  84         struct net_bridge_port __rcu    *port;
  85 };
  86
  87 /* IGMP/MLD statistics */
  88 struct bridge_mcast_stats {
  89         struct br_mcast_stats mstats;
  90         struct u64_stats_sync syncp;
  91 };
  92 #endif
  93
  94 struct br_vlan_stats {
  95         u64 rx_bytes;
  96         u64 rx_packets;
  97         u64 tx_bytes;
  98         u64 tx_packets;
  99         struct u64_stats_sync syncp;
 100 };
 101
 102 struct br_tunnel_info {
 103         __be64                  tunnel_id;
 104         struct metadata_dst     *tunnel_dst;
 105 };
 106
 107 /**
 108  * struct net_bridge_vlan - per-vlan entry
 109  *
 110  * @vnode: rhashtable member
 111  * @vid: VLAN id
 112  * @flags: bridge vlan flags
 113  * @stats: per-cpu VLAN statistics
 114  * @br: if MASTER flag set, this points to a bridge struct
 115  * @port: if MASTER flag unset, this points to a port struct
 116  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 117  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 118  *          for this VLAN entry
 119  * @vlist: sorted list of VLAN entries
 120  * @rcu: used for entry destruction
 121  *
 122  * This structure is shared between the global per-VLAN entries contained in
 123  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 124  * the port's rhashtable. The union entries should be interpreted depending on
 125  * the entry flags that are set.
 126  */
 127 struct net_bridge_vlan {
 128         struct rhash_head               vnode;
 129         struct rhash_head               tnode;
 130         u16                             vid;
 131         u16                             flags;
 132         struct br_vlan_stats __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  *
 157  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 158  *            primitives because the bridge can have entries in its list which
 159  *            are just for global context but not for filtering, i.e. they have
 160  *            the master flag set but not the brentry flag. If you have to check
 161  *            if there're "real" entries in the bridge please test @num_vlans
 162  */
 163 struct net_bridge_vlan_group {
 164         struct rhashtable               vlan_hash;
 165         struct rhashtable               tunnel_hash;
 166         struct list_head                vlan_list;
 167         u16                             num_vlans;
 168         u16                             pvid;
 169 };
 170
 171 struct net_bridge_fdb_key {
 172         mac_addr addr;
 173         u16 vlan_id;
 174 };
 175
 176 struct net_bridge_fdb_entry {
 177         struct rhash_head               rhnode;
 178         struct net_bridge_port          *dst;
 179
 180         struct net_bridge_fdb_key       key;
 181         struct hlist_node               fdb_node;
 182         unsigned char                   is_local:1,
 183                                         is_static:1,
 184                                         added_by_user:1,
 185                                         added_by_external_learn:1,
 186                                         offloaded:1;
 187
 188         /* write-heavy members should not affect lookups */
 189         unsigned long                   updated ____cacheline_aligned_in_smp;
 190         unsigned long                   used;
 191
 192         struct rcu_head                 rcu;
 193 };
 194
 195 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 196 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 197
 198 struct net_bridge_port_group {
 199         struct net_bridge_port          *port;
 200         struct net_bridge_port_group __rcu *next;
 201         struct hlist_node               mglist;
 202         struct rcu_head                 rcu;
 203         struct timer_list               timer;
 204         struct br_ip                    addr;
 205         unsigned char                   flags;
 206         unsigned char                   eth_addr[ETH_ALEN];
 207 };
 208
 209 struct net_bridge_mdb_entry
 210 {
 211         struct hlist_node               hlist[2];
 212         struct net_bridge               *br;
 213         struct net_bridge_port_group __rcu *ports;
 214         struct rcu_head                 rcu;
 215         struct timer_list               timer;
 216         struct br_ip                    addr;
 217         bool                            host_joined;
 218 };
 219
 220 struct net_bridge_mdb_htable
 221 {
 222         struct hlist_head               *mhash;
 223         struct rcu_head                 rcu;
 224         struct net_bridge_mdb_htable    *old;
 225         u32                             size;
 226         u32                             max;
 227         u32                             secret;
 228         u32                             ver;
 229 };
 230
 231 struct net_bridge_port {
 232         struct net_bridge               *br;
 233         struct net_device               *dev;
 234         struct list_head                list;
 235
 236         unsigned long                   flags;
 237 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 238         struct net_bridge_vlan_group    __rcu *vlgrp;
 239 #endif
 240
 241         /* STP */
 242         u8                              priority;
 243         u8                              state;
 244         u16                             port_no;
 245         unsigned char                   topology_change_ack;
 246         unsigned char                   config_pending;
 247         port_id                         port_id;
 248         port_id                         designated_port;
 249         bridge_id                       designated_root;
 250         bridge_id                       designated_bridge;
 251         u32                             path_cost;
 252         u32                             designated_cost;
 253         unsigned long                   designated_age;
 254
 255         struct timer_list               forward_delay_timer;
 256         struct timer_list               hold_timer;
 257         struct timer_list               message_age_timer;
 258         struct kobject                  kobj;
 259         struct rcu_head                 rcu;
 260
 261 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 262         struct bridge_mcast_own_query   ip4_own_query;
 263 #if IS_ENABLED(CONFIG_IPV6)
 264         struct bridge_mcast_own_query   ip6_own_query;
 265 #endif /* IS_ENABLED(CONFIG_IPV6) */
 266         unsigned char                   multicast_router;
 267         struct bridge_mcast_stats       __percpu *mcast_stats;
 268         struct timer_list               multicast_router_timer;
 269         struct hlist_head               mglist;
 270         struct hlist_node               rlist;
 271 #endif
 272
 273 #ifdef CONFIG_SYSFS
 274         char                            sysfs_name[IFNAMSIZ];
 275 #endif
 276
 277 #ifdef CONFIG_NET_POLL_CONTROLLER
 278         struct netpoll                  *np;
 279 #endif
 280 #ifdef CONFIG_NET_SWITCHDEV
 281         int                             offload_fwd_mark;
 282 #endif
 283         u16                             group_fwd_mask;
 284 };
 285
 286 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 287 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 288
 289 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 290
 291 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 292 {
 293         return rcu_dereference(dev->rx_handler_data);
 294 }
 295
 296 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 297 {
 298         return br_port_exists(dev) ?
 299                 rtnl_dereference(dev->rx_handler_data) : NULL;
 300 }
 301
 302 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 303 {
 304         return br_port_exists(dev) ?
 305                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 306 }
 307
 308 struct net_bridge {
 309         spinlock_t                      lock;
 310         spinlock_t                      hash_lock;
 311         struct list_head                port_list;
 312         struct net_device               *dev;
 313         struct pcpu_sw_netstats         __percpu *stats;
 314         /* These fields are accessed on each packet */
 315 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 316         u8                              vlan_enabled;
 317         u8                              vlan_stats_enabled;
 318         __be16                          vlan_proto;
 319         u16                             default_pvid;
 320         struct net_bridge_vlan_group    __rcu *vlgrp;
 321 #endif
 322
 323         struct rhashtable               fdb_hash_tbl;
 324 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 325         union {
 326                 struct rtable           fake_rtable;
 327                 struct rt6_info         fake_rt6_info;
 328         };
 329         bool                            nf_call_iptables;
 330         bool                            nf_call_ip6tables;
 331         bool                            nf_call_arptables;
 332 #endif
 333         u16                             group_fwd_mask;
 334         u16                             group_fwd_mask_required;
 335
 336         /* STP */
 337         bridge_id                       designated_root;
 338         bridge_id                       bridge_id;
 339         u32                             root_path_cost;
 340         unsigned char                   topology_change;
 341         unsigned char                   topology_change_detected;
 342         u16                             root_port;
 343         unsigned long                   max_age;
 344         unsigned long                   hello_time;
 345         unsigned long                   forward_delay;
 346         unsigned long                   ageing_time;
 347         unsigned long                   bridge_max_age;
 348         unsigned long                   bridge_hello_time;
 349         unsigned long                   bridge_forward_delay;
 350         unsigned long                   bridge_ageing_time;
 351
 352         u8                              group_addr[ETH_ALEN];
 353         bool                            group_addr_set;
 354
 355         enum {
 356                 BR_NO_STP,              /* no spanning tree */
 357                 BR_KERNEL_STP,          /* old STP in kernel */
 358                 BR_USER_STP,            /* new RSTP in userspace */
 359         } stp_enabled;
 360
 361 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 362         unsigned char                   multicast_router;
 363
 364         u8                              multicast_disabled:1;
 365         u8                              multicast_querier:1;
 366         u8                              multicast_query_use_ifaddr:1;
 367         u8                              has_ipv6_addr:1;
 368         u8                              multicast_stats_enabled:1;
 369
 370         u32                             hash_elasticity;
 371         u32                             hash_max;
 372
 373         u32                             multicast_last_member_count;
 374         u32                             multicast_startup_query_count;
 375
 376         u8                              multicast_igmp_version;
 377
 378         unsigned long                   multicast_last_member_interval;
 379         unsigned long                   multicast_membership_interval;
 380         unsigned long                   multicast_querier_interval;
 381         unsigned long                   multicast_query_interval;
 382         unsigned long                   multicast_query_response_interval;
 383         unsigned long                   multicast_startup_query_interval;
 384
 385         spinlock_t                      multicast_lock;
 386         struct net_bridge_mdb_htable __rcu *mdb;
 387         struct hlist_head               router_list;
 388
 389         struct timer_list               multicast_router_timer;
 390         struct bridge_mcast_other_query ip4_other_query;
 391         struct bridge_mcast_own_query   ip4_own_query;
 392         struct bridge_mcast_querier     ip4_querier;
 393         struct bridge_mcast_stats       __percpu *mcast_stats;
 394 #if IS_ENABLED(CONFIG_IPV6)
 395         struct bridge_mcast_other_query ip6_other_query;
 396         struct bridge_mcast_own_query   ip6_own_query;
 397         struct bridge_mcast_querier     ip6_querier;
 398         u8                              multicast_mld_version;
 399 #endif /* IS_ENABLED(CONFIG_IPV6) */
 400 #endif
 401
 402         struct timer_list               hello_timer;
 403         struct timer_list               tcn_timer;
 404         struct timer_list               topology_change_timer;
 405         struct delayed_work             gc_work;
 406         struct kobject                  *ifobj;
 407         u32                             auto_cnt;
 408
 409 #ifdef CONFIG_NET_SWITCHDEV
 410         int offload_fwd_mark;
 411 #endif
 412         bool                            neigh_suppress_enabled;
 413         bool                            mtu_set_by_user;
 414         struct hlist_head               fdb_list;
 415 };
 416
 417 struct br_input_skb_cb {
 418         struct net_device *brdev;
 419
 420 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 421         int igmp;
 422         int mrouters_only;
 423 #endif
 424
 425         bool proxyarp_replied;
 426
 427 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 428         bool vlan_filtered;
 429 #endif
 430
 431 #ifdef CONFIG_NET_SWITCHDEV
 432         int offload_fwd_mark;
 433 #endif
 434 };
 435
 436 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 437
 438 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 439 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 440 #else
 441 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 442 #endif
 443
 444 #define br_printk(level, br, format, args...)   \
 445         printk(level "%s: " format, (br)->dev->name, ##args)
 446
 447 #define br_err(__br, format, args...)                   \
 448         br_printk(KERN_ERR, __br, format, ##args)
 449 #define br_warn(__br, format, args...)                  \
 450         br_printk(KERN_WARNING, __br, format, ##args)
 451 #define br_notice(__br, format, args...)                \
 452         br_printk(KERN_NOTICE, __br, format, ##args)
 453 #define br_info(__br, format, args...)                  \
 454         br_printk(KERN_INFO, __br, format, ##args)
 455
 456 #define br_debug(br, format, args...)                   \
 457         pr_debug("%s: " format,  (br)->dev->name, ##args)
 458
 459 /* called under bridge lock */
 460 static inline int br_is_root_bridge(const struct net_bridge *br)
 461 {
 462         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 463 }
 464
 465 /* check if a VLAN entry is global */
 466 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 467 {
 468         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 469 }
 470
 471 /* check if a VLAN entry is used by the bridge */
 472 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 473 {
 474         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 475 }
 476
 477 /* check if we should use the vlan entry, returns false if it's only context */
 478 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 479 {
 480         if (br_vlan_is_master(v)) {
 481                 if (br_vlan_is_brentry(v))
 482                         return true;
 483                 else
 484                         return false;
 485         }
 486
 487         return true;
 488 }
 489
 490 /* br_device.c */
 491 void br_dev_setup(struct net_device *dev);
 492 void br_dev_delete(struct net_device *dev, struct list_head *list);
 493 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 494 #ifdef CONFIG_NET_POLL_CONTROLLER
 495 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 496                                        struct sk_buff *skb)
 497 {
 498         struct netpoll *np = p->np;
 499
 500         if (np)
 501                 netpoll_send_skb(np, skb);
 502 }
 503
 504 int br_netpoll_enable(struct net_bridge_port *p);
 505 void br_netpoll_disable(struct net_bridge_port *p);
 506 #else
 507 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 508                                        struct sk_buff *skb)
 509 {
 510 }
 511
 512 static inline int br_netpoll_enable(struct net_bridge_port *p)
 513 {
 514         return 0;
 515 }
 516
 517 static inline void br_netpoll_disable(struct net_bridge_port *p)
 518 {
 519 }
 520 #endif
 521
 522 /* br_fdb.c */
 523 int br_fdb_init(void);
 524 void br_fdb_fini(void);
 525 int br_fdb_hash_init(struct net_bridge *br);
 526 void br_fdb_hash_fini(struct net_bridge *br);
 527 void br_fdb_flush(struct net_bridge *br);
 528 void br_fdb_find_delete_local(struct net_bridge *br,
 529                               const struct net_bridge_port *p,
 530                               const unsigned char *addr, u16 vid);
 531 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 532 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 533 void br_fdb_cleanup(struct work_struct *work);
 534 void br_fdb_delete_by_port(struct net_bridge *br,
 535                            const struct net_bridge_port *p, u16 vid, int do_all);
 536 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 537                                              const unsigned char *addr,
 538                                              __u16 vid);
 539 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 540 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 541                    unsigned long off);
 542 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 543                   const unsigned char *addr, u16 vid);
 544 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 545                    const unsigned char *addr, u16 vid, bool added_by_user);
 546
 547 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 548                   struct net_device *dev, const unsigned char *addr, u16 vid);
 549 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 550                const unsigned char *addr, u16 vid, u16 nlh_flags);
 551 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 552                 struct net_device *dev, struct net_device *fdev, int *idx);
 553 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 554 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 555 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 556                               const unsigned char *addr, u16 vid);
 557 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 558                               const unsigned char *addr, u16 vid);
 559 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 560                           const unsigned char *addr, u16 vid);
 561
 562 /* br_forward.c */
 563 enum br_pkt_type {
 564         BR_PKT_UNICAST,
 565         BR_PKT_MULTICAST,
 566         BR_PKT_BROADCAST
 567 };
 568 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 569 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 570                 bool local_rcv, bool local_orig);
 571 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 572 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 573               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 574
 575 /* br_if.c */
 576 void br_port_carrier_check(struct net_bridge_port *p);
 577 int br_add_bridge(struct net *net, const char *name);
 578 int br_del_bridge(struct net *net, const char *name);
 579 int br_add_if(struct net_bridge *br, struct net_device *dev,
 580               struct netlink_ext_ack *extack);
 581 int br_del_if(struct net_bridge *br, struct net_device *dev);
 582 void br_mtu_auto_adjust(struct net_bridge *br);
 583 netdev_features_t br_features_recompute(struct net_bridge *br,
 584                                         netdev_features_t features);
 585 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 586 void br_manage_promisc(struct net_bridge *br);
 587
 588 /* br_input.c */
 589 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 590 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 591
 592 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 593 {
 594         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 595 }
 596
 597 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 598 {
 599         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 600 }
 601
 602 /* br_ioctl.c */
 603 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 604 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 605                              void __user *arg);
 606
 607 /* br_multicast.c */
 608 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 609 extern unsigned int br_mdb_rehash_seq;
 610 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 611                      struct sk_buff *skb, u16 vid);
 612 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 613                                         struct sk_buff *skb, u16 vid);
 614 int br_multicast_add_port(struct net_bridge_port *port);
 615 void br_multicast_del_port(struct net_bridge_port *port);
 616 void br_multicast_enable_port(struct net_bridge_port *port);
 617 void br_multicast_disable_port(struct net_bridge_port *port);
 618 void br_multicast_init(struct net_bridge *br);
 619 void br_multicast_open(struct net_bridge *br);
 620 void br_multicast_stop(struct net_bridge *br);
 621 void br_multicast_dev_del(struct net_bridge *br);
 622 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 623                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 624 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 625 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 626 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 627 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 628 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 629 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 630 #if IS_ENABLED(CONFIG_IPV6)
 631 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 632 #endif
 633 struct net_bridge_mdb_entry *
 634 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 635 struct net_bridge_mdb_entry *
 636 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 637                        struct br_ip *group);
 638 void br_multicast_free_pg(struct rcu_head *head);
 639 struct net_bridge_port_group *
 640 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 641                             struct net_bridge_port_group __rcu *next,
 642                             unsigned char flags, const unsigned char *src);
 643 void br_mdb_init(void);
 644 void br_mdb_uninit(void);
 645 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 646                    struct br_ip *group, int type, u8 flags);
 647 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 648                    int type);
 649 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 650                         const struct sk_buff *skb, u8 type, u8 dir);
 651 int br_multicast_init_stats(struct net_bridge *br);
 652 void br_multicast_uninit_stats(struct net_bridge *br);
 653 void br_multicast_get_stats(const struct net_bridge *br,
 654                             const struct net_bridge_port *p,
 655                             struct br_mcast_stats *dest);
 656
 657 #define mlock_dereference(X, br) \
 658         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 659
 660 static inline bool br_multicast_is_router(struct net_bridge *br)
 661 {
 662         return br->multicast_router == 2 ||
 663                (br->multicast_router == 1 &&
 664                 timer_pending(&br->multicast_router_timer));
 665 }
 666
 667 static inline bool
 668 __br_multicast_querier_exists(struct net_bridge *br,
 669                                 struct bridge_mcast_other_query *querier,
 670                                 const bool is_ipv6)
 671 {
 672         bool own_querier_enabled;
 673
 674         if (br->multicast_querier) {
 675                 if (is_ipv6 && !br->has_ipv6_addr)
 676                         own_querier_enabled = false;
 677                 else
 678                         own_querier_enabled = true;
 679         } else {
 680                 own_querier_enabled = false;
 681         }
 682
 683         return time_is_before_jiffies(querier->delay_time) &&
 684                (own_querier_enabled || timer_pending(&querier->timer));
 685 }
 686
 687 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 688                                                struct ethhdr *eth)
 689 {
 690         switch (eth->h_proto) {
 691         case (htons(ETH_P_IP)):
 692                 return __br_multicast_querier_exists(br,
 693                         &br->ip4_other_query, false);
 694 #if IS_ENABLED(CONFIG_IPV6)
 695         case (htons(ETH_P_IPV6)):
 696                 return __br_multicast_querier_exists(br,
 697                         &br->ip6_other_query, true);
 698 #endif
 699         default:
 700                 return false;
 701         }
 702 }
 703
 704 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 705 {
 706         return BR_INPUT_SKB_CB(skb)->igmp;
 707 }
 708 #else
 709 static inline int br_multicast_rcv(struct net_bridge *br,
 710                                    struct net_bridge_port *port,
 711                                    struct sk_buff *skb,
 712                                    u16 vid)
 713 {
 714         return 0;
 715 }
 716
 717 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 718                                                       struct sk_buff *skb, u16 vid)
 719 {
 720         return NULL;
 721 }
 722
 723 static inline int br_multicast_add_port(struct net_bridge_port *port)
 724 {
 725         return 0;
 726 }
 727
 728 static inline void br_multicast_del_port(struct net_bridge_port *port)
 729 {
 730 }
 731
 732 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 733 {
 734 }
 735
 736 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 737 {
 738 }
 739
 740 static inline void br_multicast_init(struct net_bridge *br)
 741 {
 742 }
 743
 744 static inline void br_multicast_open(struct net_bridge *br)
 745 {
 746 }
 747
 748 static inline void br_multicast_stop(struct net_bridge *br)
 749 {
 750 }
 751
 752 static inline void br_multicast_dev_del(struct net_bridge *br)
 753 {
 754 }
 755
 756 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 757                                       struct sk_buff *skb,
 758                                       bool local_rcv, bool local_orig)
 759 {
 760 }
 761
 762 static inline bool br_multicast_is_router(struct net_bridge *br)
 763 {
 764         return false;
 765 }
 766
 767 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 768                                                struct ethhdr *eth)
 769 {
 770         return false;
 771 }
 772
 773 static inline void br_mdb_init(void)
 774 {
 775 }
 776
 777 static inline void br_mdb_uninit(void)
 778 {
 779 }
 780
 781 static inline void br_multicast_count(struct net_bridge *br,
 782                                       const struct net_bridge_port *p,
 783                                       const struct sk_buff *skb,
 784                                       u8 type, u8 dir)
 785 {
 786 }
 787
 788 static inline int br_multicast_init_stats(struct net_bridge *br)
 789 {
 790         return 0;
 791 }
 792
 793 static inline void br_multicast_uninit_stats(struct net_bridge *br)
 794 {
 795 }
 796
 797 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 798 {
 799         return 0;
 800 }
 801 #endif
 802
 803 /* br_vlan.c */
 804 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 805 bool br_allowed_ingress(const struct net_bridge *br,
 806                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 807                         u16 *vid);
 808 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 809                        const struct sk_buff *skb);
 810 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 811 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 812                                const struct net_bridge_port *port,
 813                                struct net_bridge_vlan_group *vg,
 814                                struct sk_buff *skb);
 815 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 816                 bool *changed);
 817 int br_vlan_delete(struct net_bridge *br, u16 vid);
 818 void br_vlan_flush(struct net_bridge *br);
 819 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 820 void br_recalculate_fwd_mask(struct net_bridge *br);
 821 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 822 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 823 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 824 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 825 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 826 int br_vlan_init(struct net_bridge *br);
 827 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 828 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 829 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 830                  bool *changed);
 831 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 832 void nbp_vlan_flush(struct net_bridge_port *port);
 833 int nbp_vlan_init(struct net_bridge_port *port);
 834 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 835 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 836                        struct br_vlan_stats *stats);
 837
 838 static inline struct net_bridge_vlan_group *br_vlan_group(
 839                                         const struct net_bridge *br)
 840 {
 841         return rtnl_dereference(br->vlgrp);
 842 }
 843
 844 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 845                                         const struct net_bridge_port *p)
 846 {
 847         return rtnl_dereference(p->vlgrp);
 848 }
 849
 850 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 851                                         const struct net_bridge *br)
 852 {
 853         return rcu_dereference(br->vlgrp);
 854 }
 855
 856 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 857                                         const struct net_bridge_port *p)
 858 {
 859         return rcu_dereference(p->vlgrp);
 860 }
 861
 862 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 863  * skb, the vlan tag will always be present if the frame was tagged.
 864  */
 865 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 866 {
 867         int err = 0;
 868
 869         if (skb_vlan_tag_present(skb)) {
 870                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 871         } else {
 872                 *vid = 0;
 873                 err = -EINVAL;
 874         }
 875
 876         return err;
 877 }
 878
 879 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 880 {
 881         if (!vg)
 882                 return 0;
 883
 884         smp_rmb();
 885         return vg->pvid;
 886 }
 887
 888 #else
 889 static inline bool br_allowed_ingress(const struct net_bridge *br,
 890                                       struct net_bridge_vlan_group *vg,
 891                                       struct sk_buff *skb,
 892                                       u16 *vid)
 893 {
 894         return true;
 895 }
 896
 897 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 898                                      const struct sk_buff *skb)
 899 {
 900         return true;
 901 }
 902
 903 static inline bool br_should_learn(struct net_bridge_port *p,
 904                                    struct sk_buff *skb, u16 *vid)
 905 {
 906         return true;
 907 }
 908
 909 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 910                                              const struct net_bridge_port *port,
 911                                              struct net_bridge_vlan_group *vg,
 912                                              struct sk_buff *skb)
 913 {
 914         return skb;
 915 }
 916
 917 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 918                               bool *changed)
 919 {
 920         *changed = false;
 921         return -EOPNOTSUPP;
 922 }
 923
 924 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 925 {
 926         return -EOPNOTSUPP;
 927 }
 928
 929 static inline void br_vlan_flush(struct net_bridge *br)
 930 {
 931 }
 932
 933 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 934 {
 935 }
 936
 937 static inline int br_vlan_init(struct net_bridge *br)
 938 {
 939         return 0;
 940 }
 941
 942 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 943                                bool *changed)
 944 {
 945         *changed = false;
 946         return -EOPNOTSUPP;
 947 }
 948
 949 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 950 {
 951         return -EOPNOTSUPP;
 952 }
 953
 954 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 955 {
 956 }
 957
 958 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 959                                                    u16 vid)
 960 {
 961         return NULL;
 962 }
 963
 964 static inline int nbp_vlan_init(struct net_bridge_port *port)
 965 {
 966         return 0;
 967 }
 968
 969 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 970 {
 971         return 0;
 972 }
 973
 974 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 975 {
 976         return 0;
 977 }
 978
 979 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 980                                           unsigned long val)
 981 {
 982         return -EOPNOTSUPP;
 983 }
 984
 985 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 986                                          u32 filter_mask)
 987 {
 988         return 0;
 989 }
 990
 991 static inline struct net_bridge_vlan_group *br_vlan_group(
 992                                         const struct net_bridge *br)
 993 {
 994         return NULL;
 995 }
 996
 997 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 998                                         const struct net_bridge_port *p)
 999 {
1000         return NULL;
1001 }
1002
1003 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1004                                         const struct net_bridge *br)
1005 {
1006         return NULL;
1007 }
1008
1009 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1010                                         const struct net_bridge_port *p)
1011 {
1012         return NULL;
1013 }
1014
1015 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1016                                      struct br_vlan_stats *stats)
1017 {
1018 }
1019 #endif
1020
1021 struct nf_br_ops {
1022         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1023 };
1024 extern const struct nf_br_ops __rcu *nf_br_ops;
1025
1026 /* br_netfilter.c */
1027 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1028 int br_nf_core_init(void);
1029 void br_nf_core_fini(void);
1030 void br_netfilter_rtable_init(struct net_bridge *);
1031 #else
1032 static inline int br_nf_core_init(void) { return 0; }
1033 static inline void br_nf_core_fini(void) {}
1034 #define br_netfilter_rtable_init(x)
1035 #endif
1036
1037 /* br_stp.c */
1038 void br_set_state(struct net_bridge_port *p, unsigned int state);
1039 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1040 void br_init_port(struct net_bridge_port *p);
1041 void br_become_designated_port(struct net_bridge_port *p);
1042
1043 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1044 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1045 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1046 int br_set_max_age(struct net_bridge *br, unsigned long x);
1047 int __set_ageing_time(struct net_device *dev, unsigned long t);
1048 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1049
1050
1051 /* br_stp_if.c */
1052 void br_stp_enable_bridge(struct net_bridge *br);
1053 void br_stp_disable_bridge(struct net_bridge *br);
1054 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1055 void br_stp_enable_port(struct net_bridge_port *p);
1056 void br_stp_disable_port(struct net_bridge_port *p);
1057 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1058 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1059 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1060 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1061 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1062 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1063
1064 /* br_stp_bpdu.c */
1065 struct stp_proto;
1066 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1067                 struct net_device *dev);
1068
1069 /* br_stp_timer.c */
1070 void br_stp_timer_init(struct net_bridge *br);
1071 void br_stp_port_timer_init(struct net_bridge_port *p);
1072 unsigned long br_timer_value(const struct timer_list *timer);
1073
1074 /* br.c */
1075 #if IS_ENABLED(CONFIG_ATM_LANE)
1076 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1077 #endif
1078
1079 /* br_netlink.c */
1080 extern struct rtnl_link_ops br_link_ops;
1081 int br_netlink_init(void);
1082 void br_netlink_fini(void);
1083 void br_ifinfo_notify(int event, const struct net_bridge *br,
1084                       const struct net_bridge_port *port);
1085 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1086 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1087 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1088                u32 filter_mask, int nlflags);
1089
1090 #ifdef CONFIG_SYSFS
1091 /* br_sysfs_if.c */
1092 extern const struct sysfs_ops brport_sysfs_ops;
1093 int br_sysfs_addif(struct net_bridge_port *p);
1094 int br_sysfs_renameif(struct net_bridge_port *p);
1095
1096 /* br_sysfs_br.c */
1097 int br_sysfs_addbr(struct net_device *dev);
1098 void br_sysfs_delbr(struct net_device *dev);
1099
1100 #else
1101
1102 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1103 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1104 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1105 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1106 #endif /* CONFIG_SYSFS */
1107
1108 /* br_switchdev.c */
1109 #ifdef CONFIG_NET_SWITCHDEV
1110 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1111 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1112                               struct sk_buff *skb);
1113 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1114                                   const struct sk_buff *skb);
1115 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1116                                unsigned long flags,
1117                                unsigned long mask);
1118 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1119                              int type);
1120
1121 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1122 {
1123         skb->offload_fwd_mark = 0;
1124 }
1125 #else
1126 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1127 {
1128         return 0;
1129 }
1130
1131 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1132                                             struct sk_buff *skb)
1133 {
1134 }
1135
1136 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1137                                                 const struct sk_buff *skb)
1138 {
1139         return true;
1140 }
1141
1142 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1143                                              unsigned long flags,
1144                                              unsigned long mask)
1145 {
1146         return 0;
1147 }
1148
1149 static inline void
1150 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1151 {
1152 }
1153
1154 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1155 {
1156 }
1157 #endif /* CONFIG_NET_SWITCHDEV */
1158
1159 /* br_arp_nd_proxy.c */
1160 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1161 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1162                               u16 vid, struct net_bridge_port *p);
1163 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1164                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1165 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1166 #endif