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 #endif
  79
  80 struct br_vlan_stats {
  81         u64 rx_bytes;
  82         u64 rx_packets;
  83         u64 tx_bytes;
  84         u64 tx_packets;
  85         struct u64_stats_sync syncp;
  86 };
  87
  88 /**
  89  * struct net_bridge_vlan - per-vlan entry
  90  *
  91  * @vnode: rhashtable member
  92  * @vid: VLAN id
  93  * @flags: bridge vlan flags
  94  * @stats: per-cpu VLAN statistics
  95  * @br: if MASTER flag set, this points to a bridge struct
  96  * @port: if MASTER flag unset, this points to a port struct
  97  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
  98  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
  99  *          for this VLAN entry
 100  * @vlist: sorted list of VLAN entries
 101  * @rcu: used for entry destruction
 102  *
 103  * This structure is shared between the global per-VLAN entries contained in
 104  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 105  * the port's rhashtable. The union entries should be interpreted depending on
 106  * the entry flags that are set.
 107  */
 108 struct net_bridge_vlan {
 109         struct rhash_head               vnode;
 110         u16                             vid;
 111         u16                             flags;
 112         struct br_vlan_stats __percpu   *stats;
 113         union {
 114                 struct net_bridge       *br;
 115                 struct net_bridge_port  *port;
 116         };
 117         union {
 118                 atomic_t                refcnt;
 119                 struct net_bridge_vlan  *brvlan;
 120         };
 121         struct list_head                vlist;
 122
 123         struct rcu_head                 rcu;
 124 };
 125
 126 /**
 127  * struct net_bridge_vlan_group
 128  *
 129  * @vlan_hash: VLAN entry rhashtable
 130  * @vlan_list: sorted VLAN entry list
 131  * @num_vlans: number of total VLAN entries
 132  * @pvid: PVID VLAN id
 133  *
 134  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 135  *            primitives because the bridge can have entries in its list which
 136  *            are just for global context but not for filtering, i.e. they have
 137  *            the master flag set but not the brentry flag. If you have to check
 138  *            if there're "real" entries in the bridge please test @num_vlans
 139  */
 140 struct net_bridge_vlan_group {
 141         struct rhashtable               vlan_hash;
 142         struct list_head                vlan_list;
 143         u16                             num_vlans;
 144         u16                             pvid;
 145 };
 146
 147 struct net_bridge_fdb_entry
 148 {
 149         struct hlist_node               hlist;
 150         struct net_bridge_port          *dst;
 151
 152         unsigned long                   updated;
 153         unsigned long                   used;
 154         mac_addr                        addr;
 155         __u16                           vlan_id;
 156         unsigned char                   is_local:1,
 157                                         is_static:1,
 158                                         added_by_user:1,
 159                                         added_by_external_learn:1;
 160         struct rcu_head                 rcu;
 161 };
 162
 163 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 164 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 165
 166 struct net_bridge_port_group {
 167         struct net_bridge_port          *port;
 168         struct net_bridge_port_group __rcu *next;
 169         struct hlist_node               mglist;
 170         struct rcu_head                 rcu;
 171         struct timer_list               timer;
 172         struct br_ip                    addr;
 173         unsigned char                   flags;
 174 };
 175
 176 struct net_bridge_mdb_entry
 177 {
 178         struct hlist_node               hlist[2];
 179         struct net_bridge               *br;
 180         struct net_bridge_port_group __rcu *ports;
 181         struct rcu_head                 rcu;
 182         struct timer_list               timer;
 183         struct br_ip                    addr;
 184         bool                            mglist;
 185 };
 186
 187 struct net_bridge_mdb_htable
 188 {
 189         struct hlist_head               *mhash;
 190         struct rcu_head                 rcu;
 191         struct net_bridge_mdb_htable    *old;
 192         u32                             size;
 193         u32                             max;
 194         u32                             secret;
 195         u32                             ver;
 196 };
 197
 198 struct net_bridge_port
 199 {
 200         struct net_bridge               *br;
 201         struct net_device               *dev;
 202         struct list_head                list;
 203
 204         /* STP */
 205         u8                              priority;
 206         u8                              state;
 207         u16                             port_no;
 208         unsigned char                   topology_change_ack;
 209         unsigned char                   config_pending;
 210         port_id                         port_id;
 211         port_id                         designated_port;
 212         bridge_id                       designated_root;
 213         bridge_id                       designated_bridge;
 214         u32                             path_cost;
 215         u32                             designated_cost;
 216         unsigned long                   designated_age;
 217
 218         struct timer_list               forward_delay_timer;
 219         struct timer_list               hold_timer;
 220         struct timer_list               message_age_timer;
 221         struct kobject                  kobj;
 222         struct rcu_head                 rcu;
 223
 224         unsigned long                   flags;
 225
 226 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 227         struct bridge_mcast_own_query   ip4_own_query;
 228 #if IS_ENABLED(CONFIG_IPV6)
 229         struct bridge_mcast_own_query   ip6_own_query;
 230 #endif /* IS_ENABLED(CONFIG_IPV6) */
 231         unsigned char                   multicast_router;
 232         struct timer_list               multicast_router_timer;
 233         struct hlist_head               mglist;
 234         struct hlist_node               rlist;
 235 #endif
 236
 237 #ifdef CONFIG_SYSFS
 238         char                            sysfs_name[IFNAMSIZ];
 239 #endif
 240
 241 #ifdef CONFIG_NET_POLL_CONTROLLER
 242         struct netpoll                  *np;
 243 #endif
 244 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 245         struct net_bridge_vlan_group    __rcu *vlgrp;
 246 #endif
 247 };
 248
 249 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 250 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 251
 252 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 253
 254 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 255 {
 256         return rcu_dereference(dev->rx_handler_data);
 257 }
 258
 259 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 260 {
 261         return br_port_exists(dev) ?
 262                 rtnl_dereference(dev->rx_handler_data) : NULL;
 263 }
 264
 265 struct net_bridge
 266 {
 267         spinlock_t                      lock;
 268         struct list_head                port_list;
 269         struct net_device               *dev;
 270
 271         struct pcpu_sw_netstats         __percpu *stats;
 272         spinlock_t                      hash_lock;
 273         struct hlist_head               hash[BR_HASH_SIZE];
 274 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 275         union {
 276                 struct rtable           fake_rtable;
 277                 struct rt6_info         fake_rt6_info;
 278         };
 279         bool                            nf_call_iptables;
 280         bool                            nf_call_ip6tables;
 281         bool                            nf_call_arptables;
 282 #endif
 283         u16                             group_fwd_mask;
 284         u16                             group_fwd_mask_required;
 285
 286         /* STP */
 287         bridge_id                       designated_root;
 288         bridge_id                       bridge_id;
 289         u32                             root_path_cost;
 290         unsigned long                   max_age;
 291         unsigned long                   hello_time;
 292         unsigned long                   forward_delay;
 293         unsigned long                   bridge_max_age;
 294         unsigned long                   ageing_time;
 295         unsigned long                   bridge_hello_time;
 296         unsigned long                   bridge_forward_delay;
 297
 298         u8                              group_addr[ETH_ALEN];
 299         bool                            group_addr_set;
 300         u16                             root_port;
 301
 302         enum {
 303                 BR_NO_STP,              /* no spanning tree */
 304                 BR_KERNEL_STP,          /* old STP in kernel */
 305                 BR_USER_STP,            /* new RSTP in userspace */
 306         } stp_enabled;
 307
 308         unsigned char                   topology_change;
 309         unsigned char                   topology_change_detected;
 310
 311 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 312         unsigned char                   multicast_router;
 313
 314         u8                              multicast_disabled:1;
 315         u8                              multicast_querier:1;
 316         u8                              multicast_query_use_ifaddr:1;
 317
 318         u32                             hash_elasticity;
 319         u32                             hash_max;
 320
 321         u32                             multicast_last_member_count;
 322         u32                             multicast_startup_query_count;
 323
 324         unsigned long                   multicast_last_member_interval;
 325         unsigned long                   multicast_membership_interval;
 326         unsigned long                   multicast_querier_interval;
 327         unsigned long                   multicast_query_interval;
 328         unsigned long                   multicast_query_response_interval;
 329         unsigned long                   multicast_startup_query_interval;
 330
 331         spinlock_t                      multicast_lock;
 332         struct net_bridge_mdb_htable __rcu *mdb;
 333         struct hlist_head               router_list;
 334
 335         struct timer_list               multicast_router_timer;
 336         struct bridge_mcast_other_query ip4_other_query;
 337         struct bridge_mcast_own_query   ip4_own_query;
 338         struct bridge_mcast_querier     ip4_querier;
 339 #if IS_ENABLED(CONFIG_IPV6)
 340         struct bridge_mcast_other_query ip6_other_query;
 341         struct bridge_mcast_own_query   ip6_own_query;
 342         struct bridge_mcast_querier     ip6_querier;
 343 #endif /* IS_ENABLED(CONFIG_IPV6) */
 344 #endif
 345
 346         struct timer_list               hello_timer;
 347         struct timer_list               tcn_timer;
 348         struct timer_list               topology_change_timer;
 349         struct timer_list               gc_timer;
 350         struct kobject                  *ifobj;
 351         u32                             auto_cnt;
 352 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 353         struct net_bridge_vlan_group    __rcu *vlgrp;
 354         u8                              vlan_enabled;
 355         u8                              vlan_stats_enabled;
 356         __be16                          vlan_proto;
 357         u16                             default_pvid;
 358 #endif
 359 };
 360
 361 struct br_input_skb_cb {
 362         struct net_device *brdev;
 363
 364 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 365         int igmp;
 366         int mrouters_only;
 367 #endif
 368
 369         bool proxyarp_replied;
 370
 371 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 372         bool vlan_filtered;
 373 #endif
 374 };
 375
 376 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 377
 378 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 379 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 380 #else
 381 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 382 #endif
 383
 384 #define br_printk(level, br, format, args...)   \
 385         printk(level "%s: " format, (br)->dev->name, ##args)
 386
 387 #define br_err(__br, format, args...)                   \
 388         br_printk(KERN_ERR, __br, format, ##args)
 389 #define br_warn(__br, format, args...)                  \
 390         br_printk(KERN_WARNING, __br, format, ##args)
 391 #define br_notice(__br, format, args...)                \
 392         br_printk(KERN_NOTICE, __br, format, ##args)
 393 #define br_info(__br, format, args...)                  \
 394         br_printk(KERN_INFO, __br, format, ##args)
 395
 396 #define br_debug(br, format, args...)                   \
 397         pr_debug("%s: " format,  (br)->dev->name, ##args)
 398
 399 /* called under bridge lock */
 400 static inline int br_is_root_bridge(const struct net_bridge *br)
 401 {
 402         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 403 }
 404
 405 /* check if a VLAN entry is global */
 406 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 407 {
 408         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 409 }
 410
 411 /* check if a VLAN entry is used by the bridge */
 412 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 413 {
 414         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 415 }
 416
 417 /* check if we should use the vlan entry, returns false if it's only context */
 418 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 419 {
 420         if (br_vlan_is_master(v)) {
 421                 if (br_vlan_is_brentry(v))
 422                         return true;
 423                 else
 424                         return false;
 425         }
 426
 427         return true;
 428 }
 429
 430 /* br_device.c */
 431 void br_dev_setup(struct net_device *dev);
 432 void br_dev_delete(struct net_device *dev, struct list_head *list);
 433 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 434 #ifdef CONFIG_NET_POLL_CONTROLLER
 435 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 436                                        struct sk_buff *skb)
 437 {
 438         struct netpoll *np = p->np;
 439
 440         if (np)
 441                 netpoll_send_skb(np, skb);
 442 }
 443
 444 int br_netpoll_enable(struct net_bridge_port *p);
 445 void br_netpoll_disable(struct net_bridge_port *p);
 446 #else
 447 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 448                                        struct sk_buff *skb)
 449 {
 450 }
 451
 452 static inline int br_netpoll_enable(struct net_bridge_port *p)
 453 {
 454         return 0;
 455 }
 456
 457 static inline void br_netpoll_disable(struct net_bridge_port *p)
 458 {
 459 }
 460 #endif
 461
 462 /* br_fdb.c */
 463 int br_fdb_init(void);
 464 void br_fdb_fini(void);
 465 void br_fdb_flush(struct net_bridge *br);
 466 void br_fdb_find_delete_local(struct net_bridge *br,
 467                               const struct net_bridge_port *p,
 468                               const unsigned char *addr, u16 vid);
 469 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 470 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 471 void br_fdb_cleanup(unsigned long arg);
 472 void br_fdb_delete_by_port(struct net_bridge *br,
 473                            const struct net_bridge_port *p, u16 vid, int do_all);
 474 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 475                                           const unsigned char *addr, __u16 vid);
 476 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 477 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 478                    unsigned long off);
 479 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 480                   const unsigned char *addr, u16 vid);
 481 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 482                    const unsigned char *addr, u16 vid, bool added_by_user);
 483
 484 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 485                   struct net_device *dev, const unsigned char *addr, u16 vid);
 486 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 487                const unsigned char *addr, u16 vid, u16 nlh_flags);
 488 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 489                 struct net_device *dev, struct net_device *fdev, int idx);
 490 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 491 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 492 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 493                               const unsigned char *addr, u16 vid);
 494 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 495                               const unsigned char *addr, u16 vid);
 496
 497 /* br_forward.c */
 498 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 499 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 500 void br_forward(const struct net_bridge_port *to,
 501                 struct sk_buff *skb, struct sk_buff *skb0);
 502 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 503 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 504 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 505                       struct sk_buff *skb2, bool unicast);
 506
 507 /* br_if.c */
 508 void br_port_carrier_check(struct net_bridge_port *p);
 509 int br_add_bridge(struct net *net, const char *name);
 510 int br_del_bridge(struct net *net, const char *name);
 511 int br_add_if(struct net_bridge *br, struct net_device *dev);
 512 int br_del_if(struct net_bridge *br, struct net_device *dev);
 513 int br_min_mtu(const struct net_bridge *br);
 514 netdev_features_t br_features_recompute(struct net_bridge *br,
 515                                         netdev_features_t features);
 516 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 517 void br_manage_promisc(struct net_bridge *br);
 518
 519 /* br_input.c */
 520 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 521 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 522
 523 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 524 {
 525         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 526 }
 527
 528 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 529 {
 530         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 531 }
 532
 533 /* br_ioctl.c */
 534 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 535 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 536                              void __user *arg);
 537
 538 /* br_multicast.c */
 539 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 540 extern unsigned int br_mdb_rehash_seq;
 541 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 542                      struct sk_buff *skb, u16 vid);
 543 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 544                                         struct sk_buff *skb, u16 vid);
 545 void br_multicast_add_port(struct net_bridge_port *port);
 546 void br_multicast_del_port(struct net_bridge_port *port);
 547 void br_multicast_enable_port(struct net_bridge_port *port);
 548 void br_multicast_disable_port(struct net_bridge_port *port);
 549 void br_multicast_init(struct net_bridge *br);
 550 void br_multicast_open(struct net_bridge *br);
 551 void br_multicast_stop(struct net_bridge *br);
 552 void br_multicast_dev_del(struct net_bridge *br);
 553 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 554                           struct sk_buff *skb);
 555 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 556                           struct sk_buff *skb, struct sk_buff *skb2);
 557 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 558 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 559 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 560 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 561 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 562 struct net_bridge_mdb_entry *
 563 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 564 struct net_bridge_mdb_entry *
 565 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 566                        struct br_ip *group);
 567 void br_multicast_free_pg(struct rcu_head *head);
 568 struct net_bridge_port_group *
 569 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 570                             struct net_bridge_port_group __rcu *next,
 571                             unsigned char flags);
 572 void br_mdb_init(void);
 573 void br_mdb_uninit(void);
 574 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 575                    struct br_ip *group, int type, u8 flags);
 576 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 577                    int type);
 578
 579 #define mlock_dereference(X, br) \
 580         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 581
 582 static inline bool br_multicast_is_router(struct net_bridge *br)
 583 {
 584         return br->multicast_router == 2 ||
 585                (br->multicast_router == 1 &&
 586                 timer_pending(&br->multicast_router_timer));
 587 }
 588
 589 static inline bool
 590 __br_multicast_querier_exists(struct net_bridge *br,
 591                               struct bridge_mcast_other_query *querier)
 592 {
 593         return time_is_before_jiffies(querier->delay_time) &&
 594                (br->multicast_querier || timer_pending(&querier->timer));
 595 }
 596
 597 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 598                                                struct ethhdr *eth)
 599 {
 600         switch (eth->h_proto) {
 601         case (htons(ETH_P_IP)):
 602                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
 603 #if IS_ENABLED(CONFIG_IPV6)
 604         case (htons(ETH_P_IPV6)):
 605                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
 606 #endif
 607         default:
 608                 return false;
 609         }
 610 }
 611 #else
 612 static inline int br_multicast_rcv(struct net_bridge *br,
 613                                    struct net_bridge_port *port,
 614                                    struct sk_buff *skb,
 615                                    u16 vid)
 616 {
 617         return 0;
 618 }
 619
 620 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 621                                                       struct sk_buff *skb, u16 vid)
 622 {
 623         return NULL;
 624 }
 625
 626 static inline void br_multicast_add_port(struct net_bridge_port *port)
 627 {
 628 }
 629
 630 static inline void br_multicast_del_port(struct net_bridge_port *port)
 631 {
 632 }
 633
 634 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 635 {
 636 }
 637
 638 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 639 {
 640 }
 641
 642 static inline void br_multicast_init(struct net_bridge *br)
 643 {
 644 }
 645
 646 static inline void br_multicast_open(struct net_bridge *br)
 647 {
 648 }
 649
 650 static inline void br_multicast_stop(struct net_bridge *br)
 651 {
 652 }
 653
 654 static inline void br_multicast_dev_del(struct net_bridge *br)
 655 {
 656 }
 657
 658 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 659                                         struct sk_buff *skb)
 660 {
 661 }
 662
 663 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 664                                         struct sk_buff *skb,
 665                                         struct sk_buff *skb2)
 666 {
 667 }
 668 static inline bool br_multicast_is_router(struct net_bridge *br)
 669 {
 670         return 0;
 671 }
 672 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 673                                                struct ethhdr *eth)
 674 {
 675         return false;
 676 }
 677 static inline void br_mdb_init(void)
 678 {
 679 }
 680 static inline void br_mdb_uninit(void)
 681 {
 682 }
 683 #endif
 684
 685 /* br_vlan.c */
 686 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 687 bool br_allowed_ingress(const struct net_bridge *br,
 688                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 689                         u16 *vid);
 690 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 691                        const struct sk_buff *skb);
 692 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 693 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 694                                struct net_bridge_vlan_group *vg,
 695                                struct sk_buff *skb);
 696 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 697 int br_vlan_delete(struct net_bridge *br, u16 vid);
 698 void br_vlan_flush(struct net_bridge *br);
 699 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 700 void br_recalculate_fwd_mask(struct net_bridge *br);
 701 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 702 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 703 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 704 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 705 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 706 int br_vlan_init(struct net_bridge *br);
 707 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 708 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 709 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 710 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 711 void nbp_vlan_flush(struct net_bridge_port *port);
 712 int nbp_vlan_init(struct net_bridge_port *port);
 713 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 714 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 715                        struct br_vlan_stats *stats);
 716
 717 static inline struct net_bridge_vlan_group *br_vlan_group(
 718                                         const struct net_bridge *br)
 719 {
 720         return rtnl_dereference(br->vlgrp);
 721 }
 722
 723 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 724                                         const struct net_bridge_port *p)
 725 {
 726         return rtnl_dereference(p->vlgrp);
 727 }
 728
 729 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 730                                         const struct net_bridge *br)
 731 {
 732         return rcu_dereference(br->vlgrp);
 733 }
 734
 735 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 736                                         const struct net_bridge_port *p)
 737 {
 738         return rcu_dereference(p->vlgrp);
 739 }
 740
 741 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 742  * skb, the vlan tag will always be present if the frame was tagged.
 743  */
 744 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 745 {
 746         int err = 0;
 747
 748         if (skb_vlan_tag_present(skb)) {
 749                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 750         } else {
 751                 *vid = 0;
 752                 err = -EINVAL;
 753         }
 754
 755         return err;
 756 }
 757
 758 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 759 {
 760         if (!vg)
 761                 return 0;
 762
 763         smp_rmb();
 764         return vg->pvid;
 765 }
 766
 767 static inline int br_vlan_enabled(struct net_bridge *br)
 768 {
 769         return br->vlan_enabled;
 770 }
 771 #else
 772 static inline bool br_allowed_ingress(const struct net_bridge *br,
 773                                       struct net_bridge_vlan_group *vg,
 774                                       struct sk_buff *skb,
 775                                       u16 *vid)
 776 {
 777         return true;
 778 }
 779
 780 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 781                                      const struct sk_buff *skb)
 782 {
 783         return true;
 784 }
 785
 786 static inline bool br_should_learn(struct net_bridge_port *p,
 787                                    struct sk_buff *skb, u16 *vid)
 788 {
 789         return true;
 790 }
 791
 792 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 793                                              struct net_bridge_vlan_group *vg,
 794                                              struct sk_buff *skb)
 795 {
 796         return skb;
 797 }
 798
 799 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 800 {
 801         return -EOPNOTSUPP;
 802 }
 803
 804 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 805 {
 806         return -EOPNOTSUPP;
 807 }
 808
 809 static inline void br_vlan_flush(struct net_bridge *br)
 810 {
 811 }
 812
 813 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 814 {
 815 }
 816
 817 static inline int br_vlan_init(struct net_bridge *br)
 818 {
 819         return 0;
 820 }
 821
 822 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 823 {
 824         return -EOPNOTSUPP;
 825 }
 826
 827 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 828 {
 829         return -EOPNOTSUPP;
 830 }
 831
 832 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 833 {
 834 }
 835
 836 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 837                                                    u16 vid)
 838 {
 839         return NULL;
 840 }
 841
 842 static inline int nbp_vlan_init(struct net_bridge_port *port)
 843 {
 844         return 0;
 845 }
 846
 847 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 848 {
 849         return 0;
 850 }
 851
 852 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 853 {
 854         return 0;
 855 }
 856
 857 static inline int br_vlan_enabled(struct net_bridge *br)
 858 {
 859         return 0;
 860 }
 861
 862 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 863                                           unsigned long val)
 864 {
 865         return -EOPNOTSUPP;
 866 }
 867
 868 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 869                                          u32 filter_mask)
 870 {
 871         return 0;
 872 }
 873
 874 static inline struct net_bridge_vlan_group *br_vlan_group(
 875                                         const struct net_bridge *br)
 876 {
 877         return NULL;
 878 }
 879
 880 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 881                                         const struct net_bridge_port *p)
 882 {
 883         return NULL;
 884 }
 885
 886 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 887                                         const struct net_bridge *br)
 888 {
 889         return NULL;
 890 }
 891
 892 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 893                                         const struct net_bridge_port *p)
 894 {
 895         return NULL;
 896 }
 897
 898 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 899                                      struct br_vlan_stats *stats)
 900 {
 901 }
 902 #endif
 903
 904 struct nf_br_ops {
 905         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 906 };
 907 extern const struct nf_br_ops __rcu *nf_br_ops;
 908
 909 /* br_netfilter.c */
 910 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 911 int br_nf_core_init(void);
 912 void br_nf_core_fini(void);
 913 void br_netfilter_rtable_init(struct net_bridge *);
 914 #else
 915 static inline int br_nf_core_init(void) { return 0; }
 916 static inline void br_nf_core_fini(void) {}
 917 #define br_netfilter_rtable_init(x)
 918 #endif
 919
 920 /* br_stp.c */
 921 void br_set_state(struct net_bridge_port *p, unsigned int state);
 922 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 923 void br_init_port(struct net_bridge_port *p);
 924 void br_become_designated_port(struct net_bridge_port *p);
 925
 926 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 927 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 928 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 929 int br_set_max_age(struct net_bridge *br, unsigned long x);
 930 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
 931
 932
 933 /* br_stp_if.c */
 934 void br_stp_enable_bridge(struct net_bridge *br);
 935 void br_stp_disable_bridge(struct net_bridge *br);
 936 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 937 void br_stp_enable_port(struct net_bridge_port *p);
 938 void br_stp_disable_port(struct net_bridge_port *p);
 939 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 940 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 941 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 942 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 943 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 944 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 945
 946 /* br_stp_bpdu.c */
 947 struct stp_proto;
 948 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 949                 struct net_device *dev);
 950
 951 /* br_stp_timer.c */
 952 void br_stp_timer_init(struct net_bridge *br);
 953 void br_stp_port_timer_init(struct net_bridge_port *p);
 954 unsigned long br_timer_value(const struct timer_list *timer);
 955
 956 /* br.c */
 957 #if IS_ENABLED(CONFIG_ATM_LANE)
 958 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 959 #endif
 960
 961 /* br_netlink.c */
 962 extern struct rtnl_link_ops br_link_ops;
 963 int br_netlink_init(void);
 964 void br_netlink_fini(void);
 965 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 966 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 967 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 968 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 969                u32 filter_mask, int nlflags);
 970
 971 #ifdef CONFIG_SYSFS
 972 /* br_sysfs_if.c */
 973 extern const struct sysfs_ops brport_sysfs_ops;
 974 int br_sysfs_addif(struct net_bridge_port *p);
 975 int br_sysfs_renameif(struct net_bridge_port *p);
 976
 977 /* br_sysfs_br.c */
 978 int br_sysfs_addbr(struct net_device *dev);
 979 void br_sysfs_delbr(struct net_device *dev);
 980
 981 #else
 982
 983 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 984 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 985 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 986 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 987 #endif /* CONFIG_SYSFS */
 988
 989 #endif