net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <net/ip6_fib.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/rhashtable.h>
  24
  25 #define BR_HASH_BITS 8
  26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  27
  28 #define BR_HOLD_TIME (1*HZ)
  29
  30 #define BR_PORT_BITS    10
  31 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  32
  33 #define BR_VERSION      "2.3"
  34
  35 /* Control of forwarding link local multicast */
  36 #define BR_GROUPFWD_DEFAULT     0
  37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  38 #define BR_GROUPFWD_RESTRICTED  0x0007u
  39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  40 #define BR_GROUPFWD_8021AD      0xB801u
  41
  42 /* Path to usermode spanning tree program */
  43 #define BR_STP_PROG     "/sbin/bridge-stp"
  44
  45 typedef struct bridge_id bridge_id;
  46 typedef struct mac_addr mac_addr;
  47 typedef __u16 port_id;
  48
  49 struct bridge_id
  50 {
  51         unsigned char   prio[2];
  52         unsigned char   addr[ETH_ALEN];
  53 };
  54
  55 struct mac_addr
  56 {
  57         unsigned char   addr[ETH_ALEN];
  58 };
  59
  60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  61 /* our own querier */
  62 struct bridge_mcast_own_query {
  63         struct timer_list       timer;
  64         u32                     startup_sent;
  65 };
  66
  67 /* other querier */
  68 struct bridge_mcast_other_query {
  69         struct timer_list               timer;
  70         unsigned long                   delay_time;
  71 };
  72
  73 /* selected querier */
  74 struct bridge_mcast_querier {
  75         struct br_ip addr;
  76         struct net_bridge_port __rcu    *port;
  77 };
  78
  79 /* IGMP/MLD statistics */
  80 struct bridge_mcast_stats {
  81         struct br_mcast_stats mstats;
  82         struct u64_stats_sync syncp;
  83 };
  84 #endif
  85
  86 struct br_vlan_stats {
  87         u64 rx_bytes;
  88         u64 rx_packets;
  89         u64 tx_bytes;
  90         u64 tx_packets;
  91         struct u64_stats_sync syncp;
  92 };
  93
  94 /**
  95  * struct net_bridge_vlan - per-vlan entry
  96  *
  97  * @vnode: rhashtable member
  98  * @vid: VLAN id
  99  * @flags: bridge vlan flags
 100  * @stats: per-cpu VLAN statistics
 101  * @br: if MASTER flag set, this points to a bridge struct
 102  * @port: if MASTER flag unset, this points to a port struct
 103  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 104  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 105  *          for this VLAN entry
 106  * @vlist: sorted list of VLAN entries
 107  * @rcu: used for entry destruction
 108  *
 109  * This structure is shared between the global per-VLAN entries contained in
 110  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 111  * the port's rhashtable. The union entries should be interpreted depending on
 112  * the entry flags that are set.
 113  */
 114 struct net_bridge_vlan {
 115         struct rhash_head               vnode;
 116         u16                             vid;
 117         u16                             flags;
 118         struct br_vlan_stats __percpu   *stats;
 119         union {
 120                 struct net_bridge       *br;
 121                 struct net_bridge_port  *port;
 122         };
 123         union {
 124                 atomic_t                refcnt;
 125                 struct net_bridge_vlan  *brvlan;
 126         };
 127         struct list_head                vlist;
 128
 129         struct rcu_head                 rcu;
 130 };
 131
 132 /**
 133  * struct net_bridge_vlan_group
 134  *
 135  * @vlan_hash: VLAN entry rhashtable
 136  * @vlan_list: sorted VLAN entry list
 137  * @num_vlans: number of total VLAN entries
 138  * @pvid: PVID VLAN id
 139  *
 140  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 141  *            primitives because the bridge can have entries in its list which
 142  *            are just for global context but not for filtering, i.e. they have
 143  *            the master flag set but not the brentry flag. If you have to check
 144  *            if there're "real" entries in the bridge please test @num_vlans
 145  */
 146 struct net_bridge_vlan_group {
 147         struct rhashtable               vlan_hash;
 148         struct list_head                vlan_list;
 149         u16                             num_vlans;
 150         u16                             pvid;
 151 };
 152
 153 struct net_bridge_fdb_entry
 154 {
 155         struct hlist_node               hlist;
 156         struct net_bridge_port          *dst;
 157
 158         unsigned long                   updated;
 159         unsigned long                   used;
 160         mac_addr                        addr;
 161         __u16                           vlan_id;
 162         unsigned char                   is_local:1,
 163                                         is_static:1,
 164                                         added_by_user:1,
 165                                         added_by_external_learn:1;
 166         struct rcu_head                 rcu;
 167 };
 168
 169 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 170 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 171
 172 struct net_bridge_port_group {
 173         struct net_bridge_port          *port;
 174         struct net_bridge_port_group __rcu *next;
 175         struct hlist_node               mglist;
 176         struct rcu_head                 rcu;
 177         struct timer_list               timer;
 178         struct br_ip                    addr;
 179         unsigned char                   flags;
 180 };
 181
 182 struct net_bridge_mdb_entry
 183 {
 184         struct hlist_node               hlist[2];
 185         struct net_bridge               *br;
 186         struct net_bridge_port_group __rcu *ports;
 187         struct rcu_head                 rcu;
 188         struct timer_list               timer;
 189         struct br_ip                    addr;
 190         bool                            mglist;
 191 };
 192
 193 struct net_bridge_mdb_htable
 194 {
 195         struct hlist_head               *mhash;
 196         struct rcu_head                 rcu;
 197         struct net_bridge_mdb_htable    *old;
 198         u32                             size;
 199         u32                             max;
 200         u32                             secret;
 201         u32                             ver;
 202 };
 203
 204 struct net_bridge_port
 205 {
 206         struct net_bridge               *br;
 207         struct net_device               *dev;
 208         struct list_head                list;
 209
 210         /* STP */
 211         u8                              priority;
 212         u8                              state;
 213         u16                             port_no;
 214         unsigned char                   topology_change_ack;
 215         unsigned char                   config_pending;
 216         port_id                         port_id;
 217         port_id                         designated_port;
 218         bridge_id                       designated_root;
 219         bridge_id                       designated_bridge;
 220         u32                             path_cost;
 221         u32                             designated_cost;
 222         unsigned long                   designated_age;
 223
 224         struct timer_list               forward_delay_timer;
 225         struct timer_list               hold_timer;
 226         struct timer_list               message_age_timer;
 227         struct kobject                  kobj;
 228         struct rcu_head                 rcu;
 229
 230         unsigned long                   flags;
 231
 232 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 233         struct bridge_mcast_own_query   ip4_own_query;
 234 #if IS_ENABLED(CONFIG_IPV6)
 235         struct bridge_mcast_own_query   ip6_own_query;
 236 #endif /* IS_ENABLED(CONFIG_IPV6) */
 237         unsigned char                   multicast_router;
 238         struct bridge_mcast_stats       __percpu *mcast_stats;
 239         struct timer_list               multicast_router_timer;
 240         struct hlist_head               mglist;
 241         struct hlist_node               rlist;
 242 #endif
 243
 244 #ifdef CONFIG_SYSFS
 245         char                            sysfs_name[IFNAMSIZ];
 246 #endif
 247
 248 #ifdef CONFIG_NET_POLL_CONTROLLER
 249         struct netpoll                  *np;
 250 #endif
 251 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 252         struct net_bridge_vlan_group    __rcu *vlgrp;
 253 #endif
 254 #ifdef CONFIG_NET_SWITCHDEV
 255         int                             offload_fwd_mark;
 256 #endif
 257 };
 258
 259 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 260 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 261
 262 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 263
 264 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 265 {
 266         return rcu_dereference(dev->rx_handler_data);
 267 }
 268
 269 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 270 {
 271         return br_port_exists(dev) ?
 272                 rtnl_dereference(dev->rx_handler_data) : NULL;
 273 }
 274
 275 struct net_bridge
 276 {
 277         spinlock_t                      lock;
 278         struct list_head                port_list;
 279         struct net_device               *dev;
 280
 281         struct pcpu_sw_netstats         __percpu *stats;
 282         spinlock_t                      hash_lock;
 283         struct hlist_head               hash[BR_HASH_SIZE];
 284 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 285         union {
 286                 struct rtable           fake_rtable;
 287                 struct rt6_info         fake_rt6_info;
 288         };
 289         bool                            nf_call_iptables;
 290         bool                            nf_call_ip6tables;
 291         bool                            nf_call_arptables;
 292 #endif
 293         u16                             group_fwd_mask;
 294         u16                             group_fwd_mask_required;
 295
 296         /* STP */
 297         bridge_id                       designated_root;
 298         bridge_id                       bridge_id;
 299         u32                             root_path_cost;
 300         unsigned long                   max_age;
 301         unsigned long                   hello_time;
 302         unsigned long                   forward_delay;
 303         unsigned long                   bridge_max_age;
 304         unsigned long                   ageing_time;
 305         unsigned long                   bridge_hello_time;
 306         unsigned long                   bridge_forward_delay;
 307
 308         u8                              group_addr[ETH_ALEN];
 309         bool                            group_addr_set;
 310         u16                             root_port;
 311
 312         enum {
 313                 BR_NO_STP,              /* no spanning tree */
 314                 BR_KERNEL_STP,          /* old STP in kernel */
 315                 BR_USER_STP,            /* new RSTP in userspace */
 316         } stp_enabled;
 317
 318         unsigned char                   topology_change;
 319         unsigned char                   topology_change_detected;
 320
 321 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 322         unsigned char                   multicast_router;
 323
 324         u8                              multicast_disabled:1;
 325         u8                              multicast_querier:1;
 326         u8                              multicast_query_use_ifaddr:1;
 327         u8                              has_ipv6_addr:1;
 328         u8                              multicast_stats_enabled:1;
 329
 330         u32                             hash_elasticity;
 331         u32                             hash_max;
 332
 333         u32                             multicast_last_member_count;
 334         u32                             multicast_startup_query_count;
 335
 336         unsigned long                   multicast_last_member_interval;
 337         unsigned long                   multicast_membership_interval;
 338         unsigned long                   multicast_querier_interval;
 339         unsigned long                   multicast_query_interval;
 340         unsigned long                   multicast_query_response_interval;
 341         unsigned long                   multicast_startup_query_interval;
 342
 343         spinlock_t                      multicast_lock;
 344         struct net_bridge_mdb_htable __rcu *mdb;
 345         struct hlist_head               router_list;
 346
 347         struct timer_list               multicast_router_timer;
 348         struct bridge_mcast_other_query ip4_other_query;
 349         struct bridge_mcast_own_query   ip4_own_query;
 350         struct bridge_mcast_querier     ip4_querier;
 351         struct bridge_mcast_stats       __percpu *mcast_stats;
 352 #if IS_ENABLED(CONFIG_IPV6)
 353         struct bridge_mcast_other_query ip6_other_query;
 354         struct bridge_mcast_own_query   ip6_own_query;
 355         struct bridge_mcast_querier     ip6_querier;
 356 #endif /* IS_ENABLED(CONFIG_IPV6) */
 357 #endif
 358
 359         struct timer_list               hello_timer;
 360         struct timer_list               tcn_timer;
 361         struct timer_list               topology_change_timer;
 362         struct timer_list               gc_timer;
 363         struct kobject                  *ifobj;
 364         u32                             auto_cnt;
 365
 366 #ifdef CONFIG_NET_SWITCHDEV
 367         int offload_fwd_mark;
 368 #endif
 369
 370 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 371         struct net_bridge_vlan_group    __rcu *vlgrp;
 372         u8                              vlan_enabled;
 373         u8                              vlan_stats_enabled;
 374         __be16                          vlan_proto;
 375         u16                             default_pvid;
 376 #endif
 377 };
 378
 379 struct br_input_skb_cb {
 380         struct net_device *brdev;
 381
 382 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 383         int igmp;
 384         int mrouters_only;
 385 #endif
 386
 387         bool proxyarp_replied;
 388
 389 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 390         bool vlan_filtered;
 391 #endif
 392
 393 #ifdef CONFIG_NET_SWITCHDEV
 394         int offload_fwd_mark;
 395 #endif
 396 };
 397
 398 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 399
 400 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 401 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 402 #else
 403 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 404 #endif
 405
 406 #define br_printk(level, br, format, args...)   \
 407         printk(level "%s: " format, (br)->dev->name, ##args)
 408
 409 #define br_err(__br, format, args...)                   \
 410         br_printk(KERN_ERR, __br, format, ##args)
 411 #define br_warn(__br, format, args...)                  \
 412         br_printk(KERN_WARNING, __br, format, ##args)
 413 #define br_notice(__br, format, args...)                \
 414         br_printk(KERN_NOTICE, __br, format, ##args)
 415 #define br_info(__br, format, args...)                  \
 416         br_printk(KERN_INFO, __br, format, ##args)
 417
 418 #define br_debug(br, format, args...)                   \
 419         pr_debug("%s: " format,  (br)->dev->name, ##args)
 420
 421 /* called under bridge lock */
 422 static inline int br_is_root_bridge(const struct net_bridge *br)
 423 {
 424         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 425 }
 426
 427 /* check if a VLAN entry is global */
 428 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 429 {
 430         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 431 }
 432
 433 /* check if a VLAN entry is used by the bridge */
 434 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 435 {
 436         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 437 }
 438
 439 /* check if we should use the vlan entry, returns false if it's only context */
 440 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 441 {
 442         if (br_vlan_is_master(v)) {
 443                 if (br_vlan_is_brentry(v))
 444                         return true;
 445                 else
 446                         return false;
 447         }
 448
 449         return true;
 450 }
 451
 452 /* br_device.c */
 453 void br_dev_setup(struct net_device *dev);
 454 void br_dev_delete(struct net_device *dev, struct list_head *list);
 455 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 456 #ifdef CONFIG_NET_POLL_CONTROLLER
 457 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 458                                        struct sk_buff *skb)
 459 {
 460         struct netpoll *np = p->np;
 461
 462         if (np)
 463                 netpoll_send_skb(np, skb);
 464 }
 465
 466 int br_netpoll_enable(struct net_bridge_port *p);
 467 void br_netpoll_disable(struct net_bridge_port *p);
 468 #else
 469 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 470                                        struct sk_buff *skb)
 471 {
 472 }
 473
 474 static inline int br_netpoll_enable(struct net_bridge_port *p)
 475 {
 476         return 0;
 477 }
 478
 479 static inline void br_netpoll_disable(struct net_bridge_port *p)
 480 {
 481 }
 482 #endif
 483
 484 /* br_fdb.c */
 485 int br_fdb_init(void);
 486 void br_fdb_fini(void);
 487 void br_fdb_flush(struct net_bridge *br);
 488 void br_fdb_find_delete_local(struct net_bridge *br,
 489                               const struct net_bridge_port *p,
 490                               const unsigned char *addr, u16 vid);
 491 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 492 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 493 void br_fdb_cleanup(unsigned long arg);
 494 void br_fdb_delete_by_port(struct net_bridge *br,
 495                            const struct net_bridge_port *p, u16 vid, int do_all);
 496 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 497                                           const unsigned char *addr, __u16 vid);
 498 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 499 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 500                    unsigned long off);
 501 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 502                   const unsigned char *addr, u16 vid);
 503 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 504                    const unsigned char *addr, u16 vid, bool added_by_user);
 505
 506 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 507                   struct net_device *dev, const unsigned char *addr, u16 vid);
 508 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 509                const unsigned char *addr, u16 vid, u16 nlh_flags);
 510 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 511                 struct net_device *dev, struct net_device *fdev, int *idx);
 512 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 513 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 514 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 515                               const unsigned char *addr, u16 vid);
 516 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 517                               const unsigned char *addr, u16 vid);
 518
 519 /* br_forward.c */
 520 enum br_pkt_type {
 521         BR_PKT_UNICAST,
 522         BR_PKT_MULTICAST,
 523         BR_PKT_BROADCAST
 524 };
 525 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 526 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 527                 bool local_rcv, bool local_orig);
 528 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 529 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 530               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 531
 532 /* br_if.c */
 533 void br_port_carrier_check(struct net_bridge_port *p);
 534 int br_add_bridge(struct net *net, const char *name);
 535 int br_del_bridge(struct net *net, const char *name);
 536 int br_add_if(struct net_bridge *br, struct net_device *dev);
 537 int br_del_if(struct net_bridge *br, struct net_device *dev);
 538 int br_min_mtu(const struct net_bridge *br);
 539 netdev_features_t br_features_recompute(struct net_bridge *br,
 540                                         netdev_features_t features);
 541 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 542 void br_manage_promisc(struct net_bridge *br);
 543
 544 /* br_input.c */
 545 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 546 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 547
 548 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 549 {
 550         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 551 }
 552
 553 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 554 {
 555         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 556 }
 557
 558 /* br_ioctl.c */
 559 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 560 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 561                              void __user *arg);
 562
 563 /* br_multicast.c */
 564 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 565 extern unsigned int br_mdb_rehash_seq;
 566 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 567                      struct sk_buff *skb, u16 vid);
 568 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 569                                         struct sk_buff *skb, u16 vid);
 570 int br_multicast_add_port(struct net_bridge_port *port);
 571 void br_multicast_del_port(struct net_bridge_port *port);
 572 void br_multicast_enable_port(struct net_bridge_port *port);
 573 void br_multicast_disable_port(struct net_bridge_port *port);
 574 void br_multicast_init(struct net_bridge *br);
 575 void br_multicast_open(struct net_bridge *br);
 576 void br_multicast_stop(struct net_bridge *br);
 577 void br_multicast_dev_del(struct net_bridge *br);
 578 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 579                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 580 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 581 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 582 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 583 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 584 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 585 struct net_bridge_mdb_entry *
 586 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 587 struct net_bridge_mdb_entry *
 588 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 589                        struct br_ip *group);
 590 void br_multicast_free_pg(struct rcu_head *head);
 591 struct net_bridge_port_group *
 592 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 593                             struct net_bridge_port_group __rcu *next,
 594                             unsigned char flags);
 595 void br_mdb_init(void);
 596 void br_mdb_uninit(void);
 597 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 598                    struct br_ip *group, int type, u8 flags);
 599 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 600                    int type);
 601 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 602                         const struct sk_buff *skb, u8 type, u8 dir);
 603 int br_multicast_init_stats(struct net_bridge *br);
 604 void br_multicast_get_stats(const struct net_bridge *br,
 605                             const struct net_bridge_port *p,
 606                             struct br_mcast_stats *dest);
 607
 608 #define mlock_dereference(X, br) \
 609         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 610
 611 static inline bool br_multicast_is_router(struct net_bridge *br)
 612 {
 613         return br->multicast_router == 2 ||
 614                (br->multicast_router == 1 &&
 615                 timer_pending(&br->multicast_router_timer));
 616 }
 617
 618 static inline bool
 619 __br_multicast_querier_exists(struct net_bridge *br,
 620                                 struct bridge_mcast_other_query *querier,
 621                                 const bool is_ipv6)
 622 {
 623         bool own_querier_enabled;
 624
 625         if (br->multicast_querier) {
 626                 if (is_ipv6 && !br->has_ipv6_addr)
 627                         own_querier_enabled = false;
 628                 else
 629                         own_querier_enabled = true;
 630         } else {
 631                 own_querier_enabled = false;
 632         }
 633
 634         return time_is_before_jiffies(querier->delay_time) &&
 635                (own_querier_enabled || timer_pending(&querier->timer));
 636 }
 637
 638 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 639                                                struct ethhdr *eth)
 640 {
 641         switch (eth->h_proto) {
 642         case (htons(ETH_P_IP)):
 643                 return __br_multicast_querier_exists(br,
 644                         &br->ip4_other_query, false);
 645 #if IS_ENABLED(CONFIG_IPV6)
 646         case (htons(ETH_P_IPV6)):
 647                 return __br_multicast_querier_exists(br,
 648                         &br->ip6_other_query, true);
 649 #endif
 650         default:
 651                 return false;
 652         }
 653 }
 654
 655 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 656 {
 657         return BR_INPUT_SKB_CB(skb)->igmp;
 658 }
 659 #else
 660 static inline int br_multicast_rcv(struct net_bridge *br,
 661                                    struct net_bridge_port *port,
 662                                    struct sk_buff *skb,
 663                                    u16 vid)
 664 {
 665         return 0;
 666 }
 667
 668 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 669                                                       struct sk_buff *skb, u16 vid)
 670 {
 671         return NULL;
 672 }
 673
 674 static inline int br_multicast_add_port(struct net_bridge_port *port)
 675 {
 676         return 0;
 677 }
 678
 679 static inline void br_multicast_del_port(struct net_bridge_port *port)
 680 {
 681 }
 682
 683 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 684 {
 685 }
 686
 687 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 688 {
 689 }
 690
 691 static inline void br_multicast_init(struct net_bridge *br)
 692 {
 693 }
 694
 695 static inline void br_multicast_open(struct net_bridge *br)
 696 {
 697 }
 698
 699 static inline void br_multicast_stop(struct net_bridge *br)
 700 {
 701 }
 702
 703 static inline void br_multicast_dev_del(struct net_bridge *br)
 704 {
 705 }
 706
 707 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 708                                       struct sk_buff *skb,
 709                                       bool local_rcv, bool local_orig)
 710 {
 711 }
 712
 713 static inline bool br_multicast_is_router(struct net_bridge *br)
 714 {
 715         return 0;
 716 }
 717
 718 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 719                                                struct ethhdr *eth)
 720 {
 721         return false;
 722 }
 723
 724 static inline void br_mdb_init(void)
 725 {
 726 }
 727
 728 static inline void br_mdb_uninit(void)
 729 {
 730 }
 731
 732 static inline void br_multicast_count(struct net_bridge *br,
 733                                       const struct net_bridge_port *p,
 734                                       const struct sk_buff *skb,
 735                                       u8 type, u8 dir)
 736 {
 737 }
 738
 739 static inline int br_multicast_init_stats(struct net_bridge *br)
 740 {
 741         return 0;
 742 }
 743
 744 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 745 {
 746         return 0;
 747 }
 748 #endif
 749
 750 /* br_vlan.c */
 751 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 752 bool br_allowed_ingress(const struct net_bridge *br,
 753                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 754                         u16 *vid);
 755 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 756                        const struct sk_buff *skb);
 757 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 758 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 759                                struct net_bridge_vlan_group *vg,
 760                                struct sk_buff *skb);
 761 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 762 int br_vlan_delete(struct net_bridge *br, u16 vid);
 763 void br_vlan_flush(struct net_bridge *br);
 764 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 765 void br_recalculate_fwd_mask(struct net_bridge *br);
 766 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 767 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 768 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 769 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 770 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 771 int br_vlan_init(struct net_bridge *br);
 772 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 773 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 774 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 775 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 776 void nbp_vlan_flush(struct net_bridge_port *port);
 777 int nbp_vlan_init(struct net_bridge_port *port);
 778 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 779 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 780                        struct br_vlan_stats *stats);
 781
 782 static inline struct net_bridge_vlan_group *br_vlan_group(
 783                                         const struct net_bridge *br)
 784 {
 785         return rtnl_dereference(br->vlgrp);
 786 }
 787
 788 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 789                                         const struct net_bridge_port *p)
 790 {
 791         return rtnl_dereference(p->vlgrp);
 792 }
 793
 794 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 795                                         const struct net_bridge *br)
 796 {
 797         return rcu_dereference(br->vlgrp);
 798 }
 799
 800 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 801                                         const struct net_bridge_port *p)
 802 {
 803         return rcu_dereference(p->vlgrp);
 804 }
 805
 806 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 807  * skb, the vlan tag will always be present if the frame was tagged.
 808  */
 809 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 810 {
 811         int err = 0;
 812
 813         if (skb_vlan_tag_present(skb)) {
 814                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 815         } else {
 816                 *vid = 0;
 817                 err = -EINVAL;
 818         }
 819
 820         return err;
 821 }
 822
 823 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 824 {
 825         if (!vg)
 826                 return 0;
 827
 828         smp_rmb();
 829         return vg->pvid;
 830 }
 831
 832 static inline int br_vlan_enabled(struct net_bridge *br)
 833 {
 834         return br->vlan_enabled;
 835 }
 836 #else
 837 static inline bool br_allowed_ingress(const struct net_bridge *br,
 838                                       struct net_bridge_vlan_group *vg,
 839                                       struct sk_buff *skb,
 840                                       u16 *vid)
 841 {
 842         return true;
 843 }
 844
 845 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 846                                      const struct sk_buff *skb)
 847 {
 848         return true;
 849 }
 850
 851 static inline bool br_should_learn(struct net_bridge_port *p,
 852                                    struct sk_buff *skb, u16 *vid)
 853 {
 854         return true;
 855 }
 856
 857 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 858                                              struct net_bridge_vlan_group *vg,
 859                                              struct sk_buff *skb)
 860 {
 861         return skb;
 862 }
 863
 864 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 865 {
 866         return -EOPNOTSUPP;
 867 }
 868
 869 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 870 {
 871         return -EOPNOTSUPP;
 872 }
 873
 874 static inline void br_vlan_flush(struct net_bridge *br)
 875 {
 876 }
 877
 878 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 879 {
 880 }
 881
 882 static inline int br_vlan_init(struct net_bridge *br)
 883 {
 884         return 0;
 885 }
 886
 887 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 888 {
 889         return -EOPNOTSUPP;
 890 }
 891
 892 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 893 {
 894         return -EOPNOTSUPP;
 895 }
 896
 897 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 898 {
 899 }
 900
 901 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 902                                                    u16 vid)
 903 {
 904         return NULL;
 905 }
 906
 907 static inline int nbp_vlan_init(struct net_bridge_port *port)
 908 {
 909         return 0;
 910 }
 911
 912 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 913 {
 914         return 0;
 915 }
 916
 917 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 918 {
 919         return 0;
 920 }
 921
 922 static inline int br_vlan_enabled(struct net_bridge *br)
 923 {
 924         return 0;
 925 }
 926
 927 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 928                                           unsigned long val)
 929 {
 930         return -EOPNOTSUPP;
 931 }
 932
 933 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 934                                          u32 filter_mask)
 935 {
 936         return 0;
 937 }
 938
 939 static inline struct net_bridge_vlan_group *br_vlan_group(
 940                                         const struct net_bridge *br)
 941 {
 942         return NULL;
 943 }
 944
 945 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 946                                         const struct net_bridge_port *p)
 947 {
 948         return NULL;
 949 }
 950
 951 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 952                                         const struct net_bridge *br)
 953 {
 954         return NULL;
 955 }
 956
 957 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 958                                         const struct net_bridge_port *p)
 959 {
 960         return NULL;
 961 }
 962
 963 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 964                                      struct br_vlan_stats *stats)
 965 {
 966 }
 967 #endif
 968
 969 struct nf_br_ops {
 970         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 971 };
 972 extern const struct nf_br_ops __rcu *nf_br_ops;
 973
 974 /* br_netfilter.c */
 975 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 976 int br_nf_core_init(void);
 977 void br_nf_core_fini(void);
 978 void br_netfilter_rtable_init(struct net_bridge *);
 979 #else
 980 static inline int br_nf_core_init(void) { return 0; }
 981 static inline void br_nf_core_fini(void) {}
 982 #define br_netfilter_rtable_init(x)
 983 #endif
 984
 985 /* br_stp.c */
 986 void br_set_state(struct net_bridge_port *p, unsigned int state);
 987 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 988 void br_init_port(struct net_bridge_port *p);
 989 void br_become_designated_port(struct net_bridge_port *p);
 990
 991 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 992 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 993 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 994 int br_set_max_age(struct net_bridge *br, unsigned long x);
 995 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
 996
 997
 998 /* br_stp_if.c */
 999 void br_stp_enable_bridge(struct net_bridge *br);
1000 void br_stp_disable_bridge(struct net_bridge *br);
1001 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1002 void br_stp_enable_port(struct net_bridge_port *p);
1003 void br_stp_disable_port(struct net_bridge_port *p);
1004 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1005 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1006 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1007 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1008 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1009 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1010
1011 /* br_stp_bpdu.c */
1012 struct stp_proto;
1013 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1014                 struct net_device *dev);
1015
1016 /* br_stp_timer.c */
1017 void br_stp_timer_init(struct net_bridge *br);
1018 void br_stp_port_timer_init(struct net_bridge_port *p);
1019 unsigned long br_timer_value(const struct timer_list *timer);
1020
1021 /* br.c */
1022 #if IS_ENABLED(CONFIG_ATM_LANE)
1023 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1024 #endif
1025
1026 /* br_netlink.c */
1027 extern struct rtnl_link_ops br_link_ops;
1028 int br_netlink_init(void);
1029 void br_netlink_fini(void);
1030 void br_ifinfo_notify(int event, struct net_bridge_port *port);
1031 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1032 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1033 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1034                u32 filter_mask, int nlflags);
1035
1036 #ifdef CONFIG_SYSFS
1037 /* br_sysfs_if.c */
1038 extern const struct sysfs_ops brport_sysfs_ops;
1039 int br_sysfs_addif(struct net_bridge_port *p);
1040 int br_sysfs_renameif(struct net_bridge_port *p);
1041
1042 /* br_sysfs_br.c */
1043 int br_sysfs_addbr(struct net_device *dev);
1044 void br_sysfs_delbr(struct net_device *dev);
1045
1046 #else
1047
1048 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1049 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1050 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1051 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1052 #endif /* CONFIG_SYSFS */
1053
1054 /* br_switchdev.c */
1055 #ifdef CONFIG_NET_SWITCHDEV
1056 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1057 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1058                               struct sk_buff *skb);
1059 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1060                                   const struct sk_buff *skb);
1061 #else
1062 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1063 {
1064         return 0;
1065 }
1066
1067 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1068                                             struct sk_buff *skb)
1069 {
1070 }
1071
1072 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1073                                                 const struct sk_buff *skb)
1074 {
1075         return true;
1076 }
1077 #endif /* CONFIG_NET_SWITCHDEV */
1078
1079 #endif