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 /**
  81  * struct net_bridge_vlan - per-vlan entry
  82  *
  83  * @vnode: rhashtable member
  84  * @vid: VLAN id
  85  * @flags: bridge vlan flags
  86  * @br: if MASTER flag set, this points to a bridge struct
  87  * @port: if MASTER flag unset, this points to a port struct
  88  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
  89  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
  90  *          for this VLAN entry
  91  * @vlist: sorted list of VLAN entries
  92  * @rcu: used for entry destruction
  93  *
  94  * This structure is shared between the global per-VLAN entries contained in
  95  * the bridge rhashtable and the local per-port per-VLAN entries contained in
  96  * the port's rhashtable. The union entries should be interpreted depending on
  97  * the entry flags that are set.
  98  */
  99 struct net_bridge_vlan {
 100         struct rhash_head               vnode;
 101         u16                             vid;
 102         u16                             flags;
 103         union {
 104                 struct net_bridge       *br;
 105                 struct net_bridge_port  *port;
 106         };
 107         union {
 108                 atomic_t                refcnt;
 109                 struct net_bridge_vlan  *brvlan;
 110         };
 111         struct list_head                vlist;
 112
 113         struct rcu_head                 rcu;
 114 };
 115
 116 /**
 117  * struct net_bridge_vlan_group
 118  *
 119  * @vlan_hash: VLAN entry rhashtable
 120  * @vlan_list: sorted VLAN entry list
 121  * @num_vlans: number of total VLAN entries
 122  * @pvid: PVID VLAN id
 123  *
 124  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 125  *            primitives because the bridge can have entries in its list which
 126  *            are just for global context but not for filtering, i.e. they have
 127  *            the master flag set but not the brentry flag. If you have to check
 128  *            if there're "real" entries in the bridge please test @num_vlans
 129  */
 130 struct net_bridge_vlan_group {
 131         struct rhashtable               vlan_hash;
 132         struct list_head                vlan_list;
 133         u16                             num_vlans;
 134         u16                             pvid;
 135 };
 136
 137 struct net_bridge_fdb_entry
 138 {
 139         struct hlist_node               hlist;
 140         struct net_bridge_port          *dst;
 141
 142         unsigned long                   updated;
 143         unsigned long                   used;
 144         mac_addr                        addr;
 145         __u16                           vlan_id;
 146         unsigned char                   is_local:1,
 147                                         is_static:1,
 148                                         added_by_user:1,
 149                                         added_by_external_learn:1;
 150         struct rcu_head                 rcu;
 151 };
 152
 153 struct net_bridge_port_group {
 154         struct net_bridge_port          *port;
 155         struct net_bridge_port_group __rcu *next;
 156         struct hlist_node               mglist;
 157         struct rcu_head                 rcu;
 158         struct timer_list               timer;
 159         struct br_ip                    addr;
 160         unsigned char                   state;
 161 };
 162
 163 struct net_bridge_mdb_entry
 164 {
 165         struct hlist_node               hlist[2];
 166         struct net_bridge               *br;
 167         struct net_bridge_port_group __rcu *ports;
 168         struct rcu_head                 rcu;
 169         struct timer_list               timer;
 170         struct br_ip                    addr;
 171         bool                            mglist;
 172 };
 173
 174 struct net_bridge_mdb_htable
 175 {
 176         struct hlist_head               *mhash;
 177         struct rcu_head                 rcu;
 178         struct net_bridge_mdb_htable    *old;
 179         u32                             size;
 180         u32                             max;
 181         u32                             secret;
 182         u32                             ver;
 183 };
 184
 185 struct net_bridge_port
 186 {
 187         struct net_bridge               *br;
 188         struct net_device               *dev;
 189         struct list_head                list;
 190
 191         /* STP */
 192         u8                              priority;
 193         u8                              state;
 194         u16                             port_no;
 195         unsigned char                   topology_change_ack;
 196         unsigned char                   config_pending;
 197         port_id                         port_id;
 198         port_id                         designated_port;
 199         bridge_id                       designated_root;
 200         bridge_id                       designated_bridge;
 201         u32                             path_cost;
 202         u32                             designated_cost;
 203         unsigned long                   designated_age;
 204
 205         struct timer_list               forward_delay_timer;
 206         struct timer_list               hold_timer;
 207         struct timer_list               message_age_timer;
 208         struct kobject                  kobj;
 209         struct rcu_head                 rcu;
 210
 211         unsigned long                   flags;
 212
 213 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 214         struct bridge_mcast_own_query   ip4_own_query;
 215 #if IS_ENABLED(CONFIG_IPV6)
 216         struct bridge_mcast_own_query   ip6_own_query;
 217 #endif /* IS_ENABLED(CONFIG_IPV6) */
 218         unsigned char                   multicast_router;
 219         struct timer_list               multicast_router_timer;
 220         struct hlist_head               mglist;
 221         struct hlist_node               rlist;
 222 #endif
 223
 224 #ifdef CONFIG_SYSFS
 225         char                            sysfs_name[IFNAMSIZ];
 226 #endif
 227
 228 #ifdef CONFIG_NET_POLL_CONTROLLER
 229         struct netpoll                  *np;
 230 #endif
 231 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 232         struct net_bridge_vlan_group    __rcu *vlgrp;
 233 #endif
 234 };
 235
 236 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 237 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 238
 239 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 240
 241 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 242 {
 243         return rcu_dereference(dev->rx_handler_data);
 244 }
 245
 246 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 247 {
 248         return br_port_exists(dev) ?
 249                 rtnl_dereference(dev->rx_handler_data) : NULL;
 250 }
 251
 252 struct net_bridge
 253 {
 254         spinlock_t                      lock;
 255         struct list_head                port_list;
 256         struct net_device               *dev;
 257
 258         struct pcpu_sw_netstats         __percpu *stats;
 259         spinlock_t                      hash_lock;
 260         struct hlist_head               hash[BR_HASH_SIZE];
 261 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 262         union {
 263                 struct rtable           fake_rtable;
 264                 struct rt6_info         fake_rt6_info;
 265         };
 266         bool                            nf_call_iptables;
 267         bool                            nf_call_ip6tables;
 268         bool                            nf_call_arptables;
 269 #endif
 270         u16                             group_fwd_mask;
 271         u16                             group_fwd_mask_required;
 272
 273         /* STP */
 274         bridge_id                       designated_root;
 275         bridge_id                       bridge_id;
 276         u32                             root_path_cost;
 277         unsigned long                   max_age;
 278         unsigned long                   hello_time;
 279         unsigned long                   forward_delay;
 280         unsigned long                   bridge_max_age;
 281         unsigned long                   ageing_time;
 282         unsigned long                   bridge_hello_time;
 283         unsigned long                   bridge_forward_delay;
 284
 285         u8                              group_addr[ETH_ALEN];
 286         bool                            group_addr_set;
 287         u16                             root_port;
 288
 289         enum {
 290                 BR_NO_STP,              /* no spanning tree */
 291                 BR_KERNEL_STP,          /* old STP in kernel */
 292                 BR_USER_STP,            /* new RSTP in userspace */
 293         } stp_enabled;
 294
 295         unsigned char                   topology_change;
 296         unsigned char                   topology_change_detected;
 297
 298 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 299         unsigned char                   multicast_router;
 300
 301         u8                              multicast_disabled:1;
 302         u8                              multicast_querier:1;
 303         u8                              multicast_query_use_ifaddr:1;
 304         u8                              has_ipv6_addr:1;
 305
 306         u32                             hash_elasticity;
 307         u32                             hash_max;
 308
 309         u32                             multicast_last_member_count;
 310         u32                             multicast_startup_query_count;
 311
 312         unsigned long                   multicast_last_member_interval;
 313         unsigned long                   multicast_membership_interval;
 314         unsigned long                   multicast_querier_interval;
 315         unsigned long                   multicast_query_interval;
 316         unsigned long                   multicast_query_response_interval;
 317         unsigned long                   multicast_startup_query_interval;
 318
 319         spinlock_t                      multicast_lock;
 320         struct net_bridge_mdb_htable __rcu *mdb;
 321         struct hlist_head               router_list;
 322
 323         struct timer_list               multicast_router_timer;
 324         struct bridge_mcast_other_query ip4_other_query;
 325         struct bridge_mcast_own_query   ip4_own_query;
 326         struct bridge_mcast_querier     ip4_querier;
 327 #if IS_ENABLED(CONFIG_IPV6)
 328         struct bridge_mcast_other_query ip6_other_query;
 329         struct bridge_mcast_own_query   ip6_own_query;
 330         struct bridge_mcast_querier     ip6_querier;
 331 #endif /* IS_ENABLED(CONFIG_IPV6) */
 332 #endif
 333
 334         struct timer_list               hello_timer;
 335         struct timer_list               tcn_timer;
 336         struct timer_list               topology_change_timer;
 337         struct timer_list               gc_timer;
 338         struct kobject                  *ifobj;
 339         u32                             auto_cnt;
 340 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 341         struct net_bridge_vlan_group    __rcu *vlgrp;
 342         u8                              vlan_enabled;
 343         __be16                          vlan_proto;
 344         u16                             default_pvid;
 345 #endif
 346 };
 347
 348 struct br_input_skb_cb {
 349         struct net_device *brdev;
 350
 351 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 352         int igmp;
 353         int mrouters_only;
 354 #endif
 355
 356         bool proxyarp_replied;
 357
 358 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 359         bool vlan_filtered;
 360 #endif
 361 };
 362
 363 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 364
 365 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 366 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 367 #else
 368 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 369 #endif
 370
 371 #define br_printk(level, br, format, args...)   \
 372         printk(level "%s: " format, (br)->dev->name, ##args)
 373
 374 #define br_err(__br, format, args...)                   \
 375         br_printk(KERN_ERR, __br, format, ##args)
 376 #define br_warn(__br, format, args...)                  \
 377         br_printk(KERN_WARNING, __br, format, ##args)
 378 #define br_notice(__br, format, args...)                \
 379         br_printk(KERN_NOTICE, __br, format, ##args)
 380 #define br_info(__br, format, args...)                  \
 381         br_printk(KERN_INFO, __br, format, ##args)
 382
 383 #define br_debug(br, format, args...)                   \
 384         pr_debug("%s: " format,  (br)->dev->name, ##args)
 385
 386 /* called under bridge lock */
 387 static inline int br_is_root_bridge(const struct net_bridge *br)
 388 {
 389         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 390 }
 391
 392 /* check if a VLAN entry is global */
 393 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 394 {
 395         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 396 }
 397
 398 /* check if a VLAN entry is used by the bridge */
 399 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 400 {
 401         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 402 }
 403
 404 /* check if we should use the vlan entry, returns false if it's only context */
 405 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 406 {
 407         if (br_vlan_is_master(v)) {
 408                 if (br_vlan_is_brentry(v))
 409                         return true;
 410                 else
 411                         return false;
 412         }
 413
 414         return true;
 415 }
 416
 417 /* br_device.c */
 418 void br_dev_setup(struct net_device *dev);
 419 void br_dev_delete(struct net_device *dev, struct list_head *list);
 420 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 421 #ifdef CONFIG_NET_POLL_CONTROLLER
 422 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 423                                        struct sk_buff *skb)
 424 {
 425         struct netpoll *np = p->np;
 426
 427         if (np)
 428                 netpoll_send_skb(np, skb);
 429 }
 430
 431 int br_netpoll_enable(struct net_bridge_port *p);
 432 void br_netpoll_disable(struct net_bridge_port *p);
 433 #else
 434 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 435                                        struct sk_buff *skb)
 436 {
 437 }
 438
 439 static inline int br_netpoll_enable(struct net_bridge_port *p)
 440 {
 441         return 0;
 442 }
 443
 444 static inline void br_netpoll_disable(struct net_bridge_port *p)
 445 {
 446 }
 447 #endif
 448
 449 /* br_fdb.c */
 450 int br_fdb_init(void);
 451 void br_fdb_fini(void);
 452 void br_fdb_flush(struct net_bridge *br);
 453 void br_fdb_find_delete_local(struct net_bridge *br,
 454                               const struct net_bridge_port *p,
 455                               const unsigned char *addr, u16 vid);
 456 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 457 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 458 void br_fdb_cleanup(unsigned long arg);
 459 void br_fdb_delete_by_port(struct net_bridge *br,
 460                            const struct net_bridge_port *p, u16 vid, int do_all);
 461 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 462                                           const unsigned char *addr, __u16 vid);
 463 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 464 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 465                    unsigned long off);
 466 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 467                   const unsigned char *addr, u16 vid);
 468 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 469                    const unsigned char *addr, u16 vid, bool added_by_user);
 470
 471 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 472                   struct net_device *dev, const unsigned char *addr, u16 vid);
 473 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 474                const unsigned char *addr, u16 vid, u16 nlh_flags);
 475 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 476                 struct net_device *dev, struct net_device *fdev, int idx);
 477 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 478 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 479 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 480                               const unsigned char *addr, u16 vid);
 481 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 482                               const unsigned char *addr, u16 vid);
 483
 484 /* br_forward.c */
 485 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
 486 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 487 void br_forward(const struct net_bridge_port *to,
 488                 struct sk_buff *skb, struct sk_buff *skb0);
 489 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 490 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
 491 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 492                       struct sk_buff *skb2, bool unicast);
 493
 494 /* br_if.c */
 495 void br_port_carrier_check(struct net_bridge_port *p);
 496 int br_add_bridge(struct net *net, const char *name);
 497 int br_del_bridge(struct net *net, const char *name);
 498 int br_add_if(struct net_bridge *br, struct net_device *dev);
 499 int br_del_if(struct net_bridge *br, struct net_device *dev);
 500 int br_min_mtu(const struct net_bridge *br);
 501 netdev_features_t br_features_recompute(struct net_bridge *br,
 502                                         netdev_features_t features);
 503 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 504 void br_manage_promisc(struct net_bridge *br);
 505
 506 /* br_input.c */
 507 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 508 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 509
 510 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 511 {
 512         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 513 }
 514
 515 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 516 {
 517         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 518 }
 519
 520 /* br_ioctl.c */
 521 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 522 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 523                              void __user *arg);
 524
 525 /* br_multicast.c */
 526 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 527 extern unsigned int br_mdb_rehash_seq;
 528 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 529                      struct sk_buff *skb, u16 vid);
 530 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 531                                         struct sk_buff *skb, u16 vid);
 532 void br_multicast_add_port(struct net_bridge_port *port);
 533 void br_multicast_del_port(struct net_bridge_port *port);
 534 void br_multicast_enable_port(struct net_bridge_port *port);
 535 void br_multicast_disable_port(struct net_bridge_port *port);
 536 void br_multicast_init(struct net_bridge *br);
 537 void br_multicast_open(struct net_bridge *br);
 538 void br_multicast_stop(struct net_bridge *br);
 539 void br_multicast_dev_del(struct net_bridge *br);
 540 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 541                           struct sk_buff *skb);
 542 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 543                           struct sk_buff *skb, struct sk_buff *skb2);
 544 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 545 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 546 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 547 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 548 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 549 struct net_bridge_mdb_entry *
 550 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 551 struct net_bridge_mdb_entry *
 552 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 553                        struct br_ip *group);
 554 void br_multicast_free_pg(struct rcu_head *head);
 555 struct net_bridge_port_group *
 556 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 557                             struct net_bridge_port_group __rcu *next,
 558                             unsigned char state);
 559 void br_mdb_init(void);
 560 void br_mdb_uninit(void);
 561 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 562                    struct br_ip *group, int type, u8 state);
 563 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 564                    int type);
 565
 566 #define mlock_dereference(X, br) \
 567         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 568
 569 static inline bool br_multicast_is_router(struct net_bridge *br)
 570 {
 571         return br->multicast_router == 2 ||
 572                (br->multicast_router == 1 &&
 573                 timer_pending(&br->multicast_router_timer));
 574 }
 575
 576 static inline bool
 577 __br_multicast_querier_exists(struct net_bridge *br,
 578                                 struct bridge_mcast_other_query *querier,
 579                                 const bool is_ipv6)
 580 {
 581         bool own_querier_enabled;
 582
 583         if (br->multicast_querier) {
 584                 if (is_ipv6 && !br->has_ipv6_addr)
 585                         own_querier_enabled = false;
 586                 else
 587                         own_querier_enabled = true;
 588         } else {
 589                 own_querier_enabled = false;
 590         }
 591
 592         return time_is_before_jiffies(querier->delay_time) &&
 593                (own_querier_enabled || timer_pending(&querier->timer));
 594 }
 595
 596 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 597                                                struct ethhdr *eth)
 598 {
 599         switch (eth->h_proto) {
 600         case (htons(ETH_P_IP)):
 601                 return __br_multicast_querier_exists(br,
 602                         &br->ip4_other_query, false);
 603 #if IS_ENABLED(CONFIG_IPV6)
 604         case (htons(ETH_P_IPV6)):
 605                 return __br_multicast_querier_exists(br,
 606                         &br->ip6_other_query, true);
 607 #endif
 608         default:
 609                 return false;
 610         }
 611 }
 612 #else
 613 static inline int br_multicast_rcv(struct net_bridge *br,
 614                                    struct net_bridge_port *port,
 615                                    struct sk_buff *skb,
 616                                    u16 vid)
 617 {
 618         return 0;
 619 }
 620
 621 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 622                                                       struct sk_buff *skb, u16 vid)
 623 {
 624         return NULL;
 625 }
 626
 627 static inline void br_multicast_add_port(struct net_bridge_port *port)
 628 {
 629 }
 630
 631 static inline void br_multicast_del_port(struct net_bridge_port *port)
 632 {
 633 }
 634
 635 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 636 {
 637 }
 638
 639 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 640 {
 641 }
 642
 643 static inline void br_multicast_init(struct net_bridge *br)
 644 {
 645 }
 646
 647 static inline void br_multicast_open(struct net_bridge *br)
 648 {
 649 }
 650
 651 static inline void br_multicast_stop(struct net_bridge *br)
 652 {
 653 }
 654
 655 static inline void br_multicast_dev_del(struct net_bridge *br)
 656 {
 657 }
 658
 659 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 660                                         struct sk_buff *skb)
 661 {
 662 }
 663
 664 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 665                                         struct sk_buff *skb,
 666                                         struct sk_buff *skb2)
 667 {
 668 }
 669 static inline bool br_multicast_is_router(struct net_bridge *br)
 670 {
 671         return 0;
 672 }
 673 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 674                                                struct ethhdr *eth)
 675 {
 676         return false;
 677 }
 678 static inline void br_mdb_init(void)
 679 {
 680 }
 681 static inline void br_mdb_uninit(void)
 682 {
 683 }
 684 #endif
 685
 686 /* br_vlan.c */
 687 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 688 bool br_allowed_ingress(const struct net_bridge *br,
 689                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 690                         u16 *vid);
 691 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 692                        const struct sk_buff *skb);
 693 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 694 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 695                                struct net_bridge_vlan_group *vg,
 696                                struct sk_buff *skb);
 697 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 698 int br_vlan_delete(struct net_bridge *br, u16 vid);
 699 void br_vlan_flush(struct net_bridge *br);
 700 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 701 void br_recalculate_fwd_mask(struct net_bridge *br);
 702 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 703 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 704 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 705 int br_vlan_set_proto(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
 715 static inline struct net_bridge_vlan_group *br_vlan_group(
 716                                         const struct net_bridge *br)
 717 {
 718         return rtnl_dereference(br->vlgrp);
 719 }
 720
 721 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 722                                         const struct net_bridge_port *p)
 723 {
 724         return rtnl_dereference(p->vlgrp);
 725 }
 726
 727 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 728                                         const struct net_bridge *br)
 729 {
 730         return rcu_dereference(br->vlgrp);
 731 }
 732
 733 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 734                                         const struct net_bridge_port *p)
 735 {
 736         return rcu_dereference(p->vlgrp);
 737 }
 738
 739 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 740  * skb, the vlan tag will always be present if the frame was tagged.
 741  */
 742 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 743 {
 744         int err = 0;
 745
 746         if (skb_vlan_tag_present(skb)) {
 747                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 748         } else {
 749                 *vid = 0;
 750                 err = -EINVAL;
 751         }
 752
 753         return err;
 754 }
 755
 756 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 757 {
 758         if (!vg)
 759                 return 0;
 760
 761         smp_rmb();
 762         return vg->pvid;
 763 }
 764
 765 static inline int br_vlan_enabled(struct net_bridge *br)
 766 {
 767         return br->vlan_enabled;
 768 }
 769 #else
 770 static inline bool br_allowed_ingress(const struct net_bridge *br,
 771                                       struct net_bridge_vlan_group *vg,
 772                                       struct sk_buff *skb,
 773                                       u16 *vid)
 774 {
 775         return true;
 776 }
 777
 778 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 779                                      const struct sk_buff *skb)
 780 {
 781         return true;
 782 }
 783
 784 static inline bool br_should_learn(struct net_bridge_port *p,
 785                                    struct sk_buff *skb, u16 *vid)
 786 {
 787         return true;
 788 }
 789
 790 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 791                                              struct net_bridge_vlan_group *vg,
 792                                              struct sk_buff *skb)
 793 {
 794         return skb;
 795 }
 796
 797 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 798 {
 799         return -EOPNOTSUPP;
 800 }
 801
 802 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 803 {
 804         return -EOPNOTSUPP;
 805 }
 806
 807 static inline void br_vlan_flush(struct net_bridge *br)
 808 {
 809 }
 810
 811 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 812 {
 813 }
 814
 815 static inline int br_vlan_init(struct net_bridge *br)
 816 {
 817         return 0;
 818 }
 819
 820 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 821 {
 822         return -EOPNOTSUPP;
 823 }
 824
 825 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 826 {
 827         return -EOPNOTSUPP;
 828 }
 829
 830 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 831 {
 832 }
 833
 834 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 835                                                    u16 vid)
 836 {
 837         return NULL;
 838 }
 839
 840 static inline int nbp_vlan_init(struct net_bridge_port *port)
 841 {
 842         return 0;
 843 }
 844
 845 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 846 {
 847         return 0;
 848 }
 849
 850 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 851 {
 852         return 0;
 853 }
 854
 855 static inline int br_vlan_enabled(struct net_bridge *br)
 856 {
 857         return 0;
 858 }
 859
 860 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 861                                           unsigned long val)
 862 {
 863         return -EOPNOTSUPP;
 864 }
 865
 866 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 867                                          u32 filter_mask)
 868 {
 869         return 0;
 870 }
 871
 872 static inline struct net_bridge_vlan_group *br_vlan_group(
 873                                         const struct net_bridge *br)
 874 {
 875         return NULL;
 876 }
 877
 878 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 879                                         const struct net_bridge_port *p)
 880 {
 881         return NULL;
 882 }
 883
 884 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 885                                         const struct net_bridge *br)
 886 {
 887         return NULL;
 888 }
 889
 890 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 891                                         const struct net_bridge_port *p)
 892 {
 893         return NULL;
 894 }
 895
 896 #endif
 897
 898 struct nf_br_ops {
 899         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 900 };
 901 extern const struct nf_br_ops __rcu *nf_br_ops;
 902
 903 /* br_netfilter.c */
 904 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 905 int br_nf_core_init(void);
 906 void br_nf_core_fini(void);
 907 void br_netfilter_rtable_init(struct net_bridge *);
 908 #else
 909 static inline int br_nf_core_init(void) { return 0; }
 910 static inline void br_nf_core_fini(void) {}
 911 #define br_netfilter_rtable_init(x)
 912 #endif
 913
 914 /* br_stp.c */
 915 void br_log_state(const struct net_bridge_port *p);
 916 void br_set_state(struct net_bridge_port *p, unsigned int state);
 917 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 918 void br_init_port(struct net_bridge_port *p);
 919 void br_become_designated_port(struct net_bridge_port *p);
 920
 921 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
 922 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 923 int br_set_hello_time(struct net_bridge *br, unsigned long x);
 924 int br_set_max_age(struct net_bridge *br, unsigned long x);
 925 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
 926
 927
 928 /* br_stp_if.c */
 929 void br_stp_enable_bridge(struct net_bridge *br);
 930 void br_stp_disable_bridge(struct net_bridge *br);
 931 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 932 void br_stp_enable_port(struct net_bridge_port *p);
 933 void br_stp_disable_port(struct net_bridge_port *p);
 934 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 935 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 936 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
 937 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
 938 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
 939 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 940
 941 /* br_stp_bpdu.c */
 942 struct stp_proto;
 943 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 944                 struct net_device *dev);
 945
 946 /* br_stp_timer.c */
 947 void br_stp_timer_init(struct net_bridge *br);
 948 void br_stp_port_timer_init(struct net_bridge_port *p);
 949 unsigned long br_timer_value(const struct timer_list *timer);
 950
 951 /* br.c */
 952 #if IS_ENABLED(CONFIG_ATM_LANE)
 953 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 954 #endif
 955
 956 /* br_netlink.c */
 957 extern struct rtnl_link_ops br_link_ops;
 958 int br_netlink_init(void);
 959 void br_netlink_fini(void);
 960 void br_ifinfo_notify(int event, struct net_bridge_port *port);
 961 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 962 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
 963 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
 964                u32 filter_mask, int nlflags);
 965
 966 #ifdef CONFIG_SYSFS
 967 /* br_sysfs_if.c */
 968 extern const struct sysfs_ops brport_sysfs_ops;
 969 int br_sysfs_addif(struct net_bridge_port *p);
 970 int br_sysfs_renameif(struct net_bridge_port *p);
 971
 972 /* br_sysfs_br.c */
 973 int br_sysfs_addbr(struct net_device *dev);
 974 void br_sysfs_delbr(struct net_device *dev);
 975
 976 #else
 977
 978 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 979 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 980 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 981 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 982 #endif /* CONFIG_SYSFS */
 983
 984 #endif