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 };
 255
 256 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 257 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 258
 259 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 260
 261 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 262 {
 263         return rcu_dereference(dev->rx_handler_data);
 264 }
 265
 266 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 267 {
 268         return br_port_exists(dev) ?
 269                 rtnl_dereference(dev->rx_handler_data) : NULL;
 270 }
 271
 272 struct net_bridge
 273 {
 274         spinlock_t                      lock;
 275         struct list_head                port_list;
 276         struct net_device               *dev;
 277
 278         struct pcpu_sw_netstats         __percpu *stats;
 279         spinlock_t                      hash_lock;
 280         struct hlist_head               hash[BR_HASH_SIZE];
 281 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 282         union {
 283                 struct rtable           fake_rtable;
 284                 struct rt6_info         fake_rt6_info;
 285         };
 286         bool                            nf_call_iptables;
 287         bool                            nf_call_ip6tables;
 288         bool                            nf_call_arptables;
 289 #endif
 290         u16                             group_fwd_mask;
 291         u16                             group_fwd_mask_required;
 292
 293         /* STP */
 294         bridge_id                       designated_root;
 295         bridge_id                       bridge_id;
 296         u32                             root_path_cost;
 297         unsigned long                   max_age;
 298         unsigned long                   hello_time;
 299         unsigned long                   forward_delay;
 300         unsigned long                   bridge_max_age;
 301         unsigned long                   ageing_time;
 302         unsigned long                   bridge_hello_time;
 303         unsigned long                   bridge_forward_delay;
 304
 305         u8                              group_addr[ETH_ALEN];
 306         bool                            group_addr_set;
 307         u16                             root_port;
 308
 309         enum {
 310                 BR_NO_STP,              /* no spanning tree */
 311                 BR_KERNEL_STP,          /* old STP in kernel */
 312                 BR_USER_STP,            /* new RSTP in userspace */
 313         } stp_enabled;
 314
 315         unsigned char                   topology_change;
 316         unsigned char                   topology_change_detected;
 317
 318 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 319         unsigned char                   multicast_router;
 320
 321         u8                              multicast_disabled:1;
 322         u8                              multicast_querier:1;
 323         u8                              multicast_query_use_ifaddr:1;
 324         u8                              has_ipv6_addr:1;
 325         u8                              multicast_stats_enabled:1;
 326
 327         u32                             hash_elasticity;
 328         u32                             hash_max;
 329
 330         u32                             multicast_last_member_count;
 331         u32                             multicast_startup_query_count;
 332
 333         unsigned long                   multicast_last_member_interval;
 334         unsigned long                   multicast_membership_interval;
 335         unsigned long                   multicast_querier_interval;
 336         unsigned long                   multicast_query_interval;
 337         unsigned long                   multicast_query_response_interval;
 338         unsigned long                   multicast_startup_query_interval;
 339
 340         spinlock_t                      multicast_lock;
 341         struct net_bridge_mdb_htable __rcu *mdb;
 342         struct hlist_head               router_list;
 343
 344         struct timer_list               multicast_router_timer;
 345         struct bridge_mcast_other_query ip4_other_query;
 346         struct bridge_mcast_own_query   ip4_own_query;
 347         struct bridge_mcast_querier     ip4_querier;
 348         struct bridge_mcast_stats       __percpu *mcast_stats;
 349 #if IS_ENABLED(CONFIG_IPV6)
 350         struct bridge_mcast_other_query ip6_other_query;
 351         struct bridge_mcast_own_query   ip6_own_query;
 352         struct bridge_mcast_querier     ip6_querier;
 353 #endif /* IS_ENABLED(CONFIG_IPV6) */
 354 #endif
 355
 356         struct timer_list               hello_timer;
 357         struct timer_list               tcn_timer;
 358         struct timer_list               topology_change_timer;
 359         struct timer_list               gc_timer;
 360         struct kobject                  *ifobj;
 361         u32                             auto_cnt;
 362 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 363         struct net_bridge_vlan_group    __rcu *vlgrp;
 364         u8                              vlan_enabled;
 365         u8                              vlan_stats_enabled;
 366         __be16                          vlan_proto;
 367         u16                             default_pvid;
 368 #endif
 369 };
 370
 371 struct br_input_skb_cb {
 372         struct net_device *brdev;
 373
 374 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 375         int igmp;
 376         int mrouters_only;
 377 #endif
 378
 379         bool proxyarp_replied;
 380
 381 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 382         bool vlan_filtered;
 383 #endif
 384 };
 385
 386 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 387
 388 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 389 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 390 #else
 391 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 392 #endif
 393
 394 #define br_printk(level, br, format, args...)   \
 395         printk(level "%s: " format, (br)->dev->name, ##args)
 396
 397 #define br_err(__br, format, args...)                   \
 398         br_printk(KERN_ERR, __br, format, ##args)
 399 #define br_warn(__br, format, args...)                  \
 400         br_printk(KERN_WARNING, __br, format, ##args)
 401 #define br_notice(__br, format, args...)                \
 402         br_printk(KERN_NOTICE, __br, format, ##args)
 403 #define br_info(__br, format, args...)                  \
 404         br_printk(KERN_INFO, __br, format, ##args)
 405
 406 #define br_debug(br, format, args...)                   \
 407         pr_debug("%s: " format,  (br)->dev->name, ##args)
 408
 409 /* called under bridge lock */
 410 static inline int br_is_root_bridge(const struct net_bridge *br)
 411 {
 412         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 413 }
 414
 415 /* check if a VLAN entry is global */
 416 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 417 {
 418         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 419 }
 420
 421 /* check if a VLAN entry is used by the bridge */
 422 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 423 {
 424         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 425 }
 426
 427 /* check if we should use the vlan entry, returns false if it's only context */
 428 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 429 {
 430         if (br_vlan_is_master(v)) {
 431                 if (br_vlan_is_brentry(v))
 432                         return true;
 433                 else
 434                         return false;
 435         }
 436
 437         return true;
 438 }
 439
 440 /* br_device.c */
 441 void br_dev_setup(struct net_device *dev);
 442 void br_dev_delete(struct net_device *dev, struct list_head *list);
 443 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 444 #ifdef CONFIG_NET_POLL_CONTROLLER
 445 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 446                                        struct sk_buff *skb)
 447 {
 448         struct netpoll *np = p->np;
 449
 450         if (np)
 451                 netpoll_send_skb(np, skb);
 452 }
 453
 454 int br_netpoll_enable(struct net_bridge_port *p);
 455 void br_netpoll_disable(struct net_bridge_port *p);
 456 #else
 457 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 458                                        struct sk_buff *skb)
 459 {
 460 }
 461
 462 static inline int br_netpoll_enable(struct net_bridge_port *p)
 463 {
 464         return 0;
 465 }
 466
 467 static inline void br_netpoll_disable(struct net_bridge_port *p)
 468 {
 469 }
 470 #endif
 471
 472 /* br_fdb.c */
 473 int br_fdb_init(void);
 474 void br_fdb_fini(void);
 475 void br_fdb_flush(struct net_bridge *br);
 476 void br_fdb_find_delete_local(struct net_bridge *br,
 477                               const struct net_bridge_port *p,
 478                               const unsigned char *addr, u16 vid);
 479 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 480 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 481 void br_fdb_cleanup(unsigned long arg);
 482 void br_fdb_delete_by_port(struct net_bridge *br,
 483                            const struct net_bridge_port *p, u16 vid, int do_all);
 484 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 485                                           const unsigned char *addr, __u16 vid);
 486 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 487 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 488                    unsigned long off);
 489 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 490                   const unsigned char *addr, u16 vid);
 491 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 492                    const unsigned char *addr, u16 vid, bool added_by_user);
 493
 494 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 495                   struct net_device *dev, const unsigned char *addr, u16 vid);
 496 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 497                const unsigned char *addr, u16 vid, u16 nlh_flags);
 498 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 499                 struct net_device *dev, struct net_device *fdev, int idx);
 500 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 501 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 502 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 503                               const unsigned char *addr, u16 vid);
 504 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 505                               const unsigned char *addr, u16 vid);
 506
 507 /* br_forward.c */
 508 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 509 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 510                 bool local_rcv, bool local_orig);
 511 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 512 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 513               bool unicast, bool local_rcv, bool local_orig);
 514
 515 /* br_if.c */
 516 void br_port_carrier_check(struct net_bridge_port *p);
 517 int br_add_bridge(struct net *net, const char *name);
 518 int br_del_bridge(struct net *net, const char *name);
 519 int br_add_if(struct net_bridge *br, struct net_device *dev);
 520 int br_del_if(struct net_bridge *br, struct net_device *dev);
 521 int br_min_mtu(const struct net_bridge *br);
 522 netdev_features_t br_features_recompute(struct net_bridge *br,
 523                                         netdev_features_t features);
 524 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 525 void br_manage_promisc(struct net_bridge *br);
 526
 527 /* br_input.c */
 528 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 529 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 530
 531 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 532 {
 533         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 534 }
 535
 536 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 537 {
 538         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 539 }
 540
 541 /* br_ioctl.c */
 542 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 543 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 544                              void __user *arg);
 545
 546 /* br_multicast.c */
 547 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 548 extern unsigned int br_mdb_rehash_seq;
 549 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 550                      struct sk_buff *skb, u16 vid);
 551 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 552                                         struct sk_buff *skb, u16 vid);
 553 int br_multicast_add_port(struct net_bridge_port *port);
 554 void br_multicast_del_port(struct net_bridge_port *port);
 555 void br_multicast_enable_port(struct net_bridge_port *port);
 556 void br_multicast_disable_port(struct net_bridge_port *port);
 557 void br_multicast_init(struct net_bridge *br);
 558 void br_multicast_open(struct net_bridge *br);
 559 void br_multicast_stop(struct net_bridge *br);
 560 void br_multicast_dev_del(struct net_bridge *br);
 561 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 562                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 563 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 564 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 565 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 566 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 567 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 568 struct net_bridge_mdb_entry *
 569 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 570 struct net_bridge_mdb_entry *
 571 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 572                        struct br_ip *group);
 573 void br_multicast_free_pg(struct rcu_head *head);
 574 struct net_bridge_port_group *
 575 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 576                             struct net_bridge_port_group __rcu *next,
 577                             unsigned char flags);
 578 void br_mdb_init(void);
 579 void br_mdb_uninit(void);
 580 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 581                    struct br_ip *group, int type, u8 flags);
 582 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 583                    int type);
 584 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 585                         const struct sk_buff *skb, u8 type, u8 dir);
 586 int br_multicast_init_stats(struct net_bridge *br);
 587 void br_multicast_get_stats(const struct net_bridge *br,
 588                             const struct net_bridge_port *p,
 589                             struct br_mcast_stats *dest);
 590
 591 #define mlock_dereference(X, br) \
 592         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 593
 594 static inline bool br_multicast_is_router(struct net_bridge *br)
 595 {
 596         return br->multicast_router == 2 ||
 597                (br->multicast_router == 1 &&
 598                 timer_pending(&br->multicast_router_timer));
 599 }
 600
 601 static inline bool
 602 __br_multicast_querier_exists(struct net_bridge *br,
 603                                 struct bridge_mcast_other_query *querier,
 604                                 const bool is_ipv6)
 605 {
 606         bool own_querier_enabled;
 607
 608         if (br->multicast_querier) {
 609                 if (is_ipv6 && !br->has_ipv6_addr)
 610                         own_querier_enabled = false;
 611                 else
 612                         own_querier_enabled = true;
 613         } else {
 614                 own_querier_enabled = false;
 615         }
 616
 617         return time_is_before_jiffies(querier->delay_time) &&
 618                (own_querier_enabled || timer_pending(&querier->timer));
 619 }
 620
 621 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 622                                                struct ethhdr *eth)
 623 {
 624         switch (eth->h_proto) {
 625         case (htons(ETH_P_IP)):
 626                 return __br_multicast_querier_exists(br,
 627                         &br->ip4_other_query, false);
 628 #if IS_ENABLED(CONFIG_IPV6)
 629         case (htons(ETH_P_IPV6)):
 630                 return __br_multicast_querier_exists(br,
 631                         &br->ip6_other_query, true);
 632 #endif
 633         default:
 634                 return false;
 635         }
 636 }
 637
 638 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 639 {
 640         return BR_INPUT_SKB_CB(skb)->igmp;
 641 }
 642 #else
 643 static inline int br_multicast_rcv(struct net_bridge *br,
 644                                    struct net_bridge_port *port,
 645                                    struct sk_buff *skb,
 646                                    u16 vid)
 647 {
 648         return 0;
 649 }
 650
 651 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 652                                                       struct sk_buff *skb, u16 vid)
 653 {
 654         return NULL;
 655 }
 656
 657 static inline int br_multicast_add_port(struct net_bridge_port *port)
 658 {
 659         return 0;
 660 }
 661
 662 static inline void br_multicast_del_port(struct net_bridge_port *port)
 663 {
 664 }
 665
 666 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 667 {
 668 }
 669
 670 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 671 {
 672 }
 673
 674 static inline void br_multicast_init(struct net_bridge *br)
 675 {
 676 }
 677
 678 static inline void br_multicast_open(struct net_bridge *br)
 679 {
 680 }
 681
 682 static inline void br_multicast_stop(struct net_bridge *br)
 683 {
 684 }
 685
 686 static inline void br_multicast_dev_del(struct net_bridge *br)
 687 {
 688 }
 689
 690 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 691                                       struct sk_buff *skb,
 692                                       bool local_rcv, bool local_orig)
 693 {
 694 }
 695
 696 static inline bool br_multicast_is_router(struct net_bridge *br)
 697 {
 698         return 0;
 699 }
 700
 701 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 702                                                struct ethhdr *eth)
 703 {
 704         return false;
 705 }
 706
 707 static inline void br_mdb_init(void)
 708 {
 709 }
 710
 711 static inline void br_mdb_uninit(void)
 712 {
 713 }
 714
 715 static inline void br_multicast_count(struct net_bridge *br,
 716                                       const struct net_bridge_port *p,
 717                                       const struct sk_buff *skb,
 718                                       u8 type, u8 dir)
 719 {
 720 }
 721
 722 static inline int br_multicast_init_stats(struct net_bridge *br)
 723 {
 724         return 0;
 725 }
 726
 727 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 728 {
 729         return 0;
 730 }
 731 #endif
 732
 733 /* br_vlan.c */
 734 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 735 bool br_allowed_ingress(const struct net_bridge *br,
 736                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 737                         u16 *vid);
 738 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 739                        const struct sk_buff *skb);
 740 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 741 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 742                                struct net_bridge_vlan_group *vg,
 743                                struct sk_buff *skb);
 744 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 745 int br_vlan_delete(struct net_bridge *br, u16 vid);
 746 void br_vlan_flush(struct net_bridge *br);
 747 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 748 void br_recalculate_fwd_mask(struct net_bridge *br);
 749 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 750 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 751 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 752 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 753 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 754 int br_vlan_init(struct net_bridge *br);
 755 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 756 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 757 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 758 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 759 void nbp_vlan_flush(struct net_bridge_port *port);
 760 int nbp_vlan_init(struct net_bridge_port *port);
 761 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 762 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 763                        struct br_vlan_stats *stats);
 764
 765 static inline struct net_bridge_vlan_group *br_vlan_group(
 766                                         const struct net_bridge *br)
 767 {
 768         return rtnl_dereference(br->vlgrp);
 769 }
 770
 771 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 772                                         const struct net_bridge_port *p)
 773 {
 774         return rtnl_dereference(p->vlgrp);
 775 }
 776
 777 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 778                                         const struct net_bridge *br)
 779 {
 780         return rcu_dereference(br->vlgrp);
 781 }
 782
 783 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 784                                         const struct net_bridge_port *p)
 785 {
 786         return rcu_dereference(p->vlgrp);
 787 }
 788
 789 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 790  * skb, the vlan tag will always be present if the frame was tagged.
 791  */
 792 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 793 {
 794         int err = 0;
 795
 796         if (skb_vlan_tag_present(skb)) {
 797                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 798         } else {
 799                 *vid = 0;
 800                 err = -EINVAL;
 801         }
 802
 803         return err;
 804 }
 805
 806 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 807 {
 808         if (!vg)
 809                 return 0;
 810
 811         smp_rmb();
 812         return vg->pvid;
 813 }
 814
 815 static inline int br_vlan_enabled(struct net_bridge *br)
 816 {
 817         return br->vlan_enabled;
 818 }
 819 #else
 820 static inline bool br_allowed_ingress(const struct net_bridge *br,
 821                                       struct net_bridge_vlan_group *vg,
 822                                       struct sk_buff *skb,
 823                                       u16 *vid)
 824 {
 825         return true;
 826 }
 827
 828 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 829                                      const struct sk_buff *skb)
 830 {
 831         return true;
 832 }
 833
 834 static inline bool br_should_learn(struct net_bridge_port *p,
 835                                    struct sk_buff *skb, u16 *vid)
 836 {
 837         return true;
 838 }
 839
 840 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 841                                              struct net_bridge_vlan_group *vg,
 842                                              struct sk_buff *skb)
 843 {
 844         return skb;
 845 }
 846
 847 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 848 {
 849         return -EOPNOTSUPP;
 850 }
 851
 852 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 853 {
 854         return -EOPNOTSUPP;
 855 }
 856
 857 static inline void br_vlan_flush(struct net_bridge *br)
 858 {
 859 }
 860
 861 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 862 {
 863 }
 864
 865 static inline int br_vlan_init(struct net_bridge *br)
 866 {
 867         return 0;
 868 }
 869
 870 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 871 {
 872         return -EOPNOTSUPP;
 873 }
 874
 875 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 876 {
 877         return -EOPNOTSUPP;
 878 }
 879
 880 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 881 {
 882 }
 883
 884 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 885                                                    u16 vid)
 886 {
 887         return NULL;
 888 }
 889
 890 static inline int nbp_vlan_init(struct net_bridge_port *port)
 891 {
 892         return 0;
 893 }
 894
 895 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 896 {
 897         return 0;
 898 }
 899
 900 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 901 {
 902         return 0;
 903 }
 904
 905 static inline int br_vlan_enabled(struct net_bridge *br)
 906 {
 907         return 0;
 908 }
 909
 910 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 911                                           unsigned long val)
 912 {
 913         return -EOPNOTSUPP;
 914 }
 915
 916 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 917                                          u32 filter_mask)
 918 {
 919         return 0;
 920 }
 921
 922 static inline struct net_bridge_vlan_group *br_vlan_group(
 923                                         const struct net_bridge *br)
 924 {
 925         return NULL;
 926 }
 927
 928 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 929                                         const struct net_bridge_port *p)
 930 {
 931         return NULL;
 932 }
 933
 934 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 935                                         const struct net_bridge *br)
 936 {
 937         return NULL;
 938 }
 939
 940 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 941                                         const struct net_bridge_port *p)
 942 {
 943         return NULL;
 944 }
 945
 946 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 947                                      struct br_vlan_stats *stats)
 948 {
 949 }
 950 #endif
 951
 952 struct nf_br_ops {
 953         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 954 };
 955 extern const struct nf_br_ops __rcu *nf_br_ops;
 956
 957 /* br_netfilter.c */
 958 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 959 int br_nf_core_init(void);
 960 void br_nf_core_fini(void);
 961 void br_netfilter_rtable_init(struct net_bridge *);
 962 #else
 963 static inline int br_nf_core_init(void) { return 0; }
 964 static inline void br_nf_core_fini(void) {}
 965 #define br_netfilter_rtable_init(x)
 966 #endif
 967
 968 /* br_stp.c */
 969 void br_set_state(struct net_bridge_port *p, unsigned int state);
 970 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 971 void br_init_port(struct net_bridge_port *p);
 972 void br_become_designated_port(struct net_bridge_port *p);
 973
 974 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 975 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 976 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 977 int br_set_max_age(struct net_bridge *br, unsigned long x);
 978 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
 979
 980
 981 /* br_stp_if.c */
 982 void br_stp_enable_bridge(struct net_bridge *br);
 983 void br_stp_disable_bridge(struct net_bridge *br);
 984 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 985 void br_stp_enable_port(struct net_bridge_port *p);
 986 void br_stp_disable_port(struct net_bridge_port *p);
 987 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 988 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 989 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 990 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 991 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 992 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 993
 994 /* br_stp_bpdu.c */
 995 struct stp_proto;
 996 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 997                 struct net_device *dev);
 998
 999 /* br_stp_timer.c */
1000 void br_stp_timer_init(struct net_bridge *br);
1001 void br_stp_port_timer_init(struct net_bridge_port *p);
1002 unsigned long br_timer_value(const struct timer_list *timer);
1003
1004 /* br.c */
1005 #if IS_ENABLED(CONFIG_ATM_LANE)
1006 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1007 #endif
1008
1009 /* br_netlink.c */
1010 extern struct rtnl_link_ops br_link_ops;
1011 int br_netlink_init(void);
1012 void br_netlink_fini(void);
1013 void br_ifinfo_notify(int event, struct net_bridge_port *port);
1014 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1015 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1016 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1017                u32 filter_mask, int nlflags);
1018
1019 #ifdef CONFIG_SYSFS
1020 /* br_sysfs_if.c */
1021 extern const struct sysfs_ops brport_sysfs_ops;
1022 int br_sysfs_addif(struct net_bridge_port *p);
1023 int br_sysfs_renameif(struct net_bridge_port *p);
1024
1025 /* br_sysfs_br.c */
1026 int br_sysfs_addbr(struct net_device *dev);
1027 void br_sysfs_delbr(struct net_device *dev);
1028
1029 #else
1030
1031 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1032 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1033 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1034 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1035 #endif /* CONFIG_SYSFS */
1036
1037 #endif