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 struct br_tunnel_info {
  95         __be64                  tunnel_id;
  96         struct metadata_dst     *tunnel_dst;
  97 };
  98
  99 /**
 100  * struct net_bridge_vlan - per-vlan entry
 101  *
 102  * @vnode: rhashtable member
 103  * @vid: VLAN id
 104  * @flags: bridge vlan flags
 105  * @stats: per-cpu VLAN statistics
 106  * @br: if MASTER flag set, this points to a bridge struct
 107  * @port: if MASTER flag unset, this points to a port struct
 108  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 109  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 110  *          for this VLAN entry
 111  * @vlist: sorted list of VLAN entries
 112  * @rcu: used for entry destruction
 113  *
 114  * This structure is shared between the global per-VLAN entries contained in
 115  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 116  * the port's rhashtable. The union entries should be interpreted depending on
 117  * the entry flags that are set.
 118  */
 119 struct net_bridge_vlan {
 120         struct rhash_head               vnode;
 121         struct rhash_head               tnode;
 122         u16                             vid;
 123         u16                             flags;
 124         struct br_vlan_stats __percpu   *stats;
 125         union {
 126                 struct net_bridge       *br;
 127                 struct net_bridge_port  *port;
 128         };
 129         union {
 130                 atomic_t                refcnt;
 131                 struct net_bridge_vlan  *brvlan;
 132         };
 133
 134         struct br_tunnel_info           tinfo;
 135
 136         struct list_head                vlist;
 137
 138         struct rcu_head                 rcu;
 139 };
 140
 141 /**
 142  * struct net_bridge_vlan_group
 143  *
 144  * @vlan_hash: VLAN entry rhashtable
 145  * @vlan_list: sorted VLAN entry list
 146  * @num_vlans: number of total VLAN entries
 147  * @pvid: PVID VLAN id
 148  *
 149  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 150  *            primitives because the bridge can have entries in its list which
 151  *            are just for global context but not for filtering, i.e. they have
 152  *            the master flag set but not the brentry flag. If you have to check
 153  *            if there're "real" entries in the bridge please test @num_vlans
 154  */
 155 struct net_bridge_vlan_group {
 156         struct rhashtable               vlan_hash;
 157         struct rhashtable               tunnel_hash;
 158         struct list_head                vlan_list;
 159         u16                             num_vlans;
 160         u16                             pvid;
 161 };
 162
 163 struct net_bridge_fdb_entry {
 164         struct hlist_node               hlist;
 165         struct net_bridge_port          *dst;
 166
 167         mac_addr                        addr;
 168         __u16                           vlan_id;
 169         unsigned char                   is_local:1,
 170                                         is_static:1,
 171                                         added_by_user:1,
 172                                         added_by_external_learn:1;
 173
 174         /* write-heavy members should not affect lookups */
 175         unsigned long                   updated ____cacheline_aligned_in_smp;
 176         unsigned long                   used;
 177
 178         struct rcu_head                 rcu;
 179 };
 180
 181 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 182 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 183
 184 struct net_bridge_port_group {
 185         struct net_bridge_port          *port;
 186         struct net_bridge_port_group __rcu *next;
 187         struct hlist_node               mglist;
 188         struct rcu_head                 rcu;
 189         struct timer_list               timer;
 190         struct br_ip                    addr;
 191         unsigned char                   flags;
 192         unsigned char                   eth_addr[ETH_ALEN];
 193 };
 194
 195 struct net_bridge_mdb_entry
 196 {
 197         struct hlist_node               hlist[2];
 198         struct net_bridge               *br;
 199         struct net_bridge_port_group __rcu *ports;
 200         struct rcu_head                 rcu;
 201         struct timer_list               timer;
 202         struct br_ip                    addr;
 203         bool                            mglist;
 204 };
 205
 206 struct net_bridge_mdb_htable
 207 {
 208         struct hlist_head               *mhash;
 209         struct rcu_head                 rcu;
 210         struct net_bridge_mdb_htable    *old;
 211         u32                             size;
 212         u32                             max;
 213         u32                             secret;
 214         u32                             ver;
 215 };
 216
 217 struct net_bridge_port {
 218         struct net_bridge               *br;
 219         struct net_device               *dev;
 220         struct list_head                list;
 221
 222         unsigned long                   flags;
 223 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 224         struct net_bridge_vlan_group    __rcu *vlgrp;
 225 #endif
 226
 227         /* STP */
 228         u8                              priority;
 229         u8                              state;
 230         u16                             port_no;
 231         unsigned char                   topology_change_ack;
 232         unsigned char                   config_pending;
 233         port_id                         port_id;
 234         port_id                         designated_port;
 235         bridge_id                       designated_root;
 236         bridge_id                       designated_bridge;
 237         u32                             path_cost;
 238         u32                             designated_cost;
 239         unsigned long                   designated_age;
 240
 241         struct timer_list               forward_delay_timer;
 242         struct timer_list               hold_timer;
 243         struct timer_list               message_age_timer;
 244         struct kobject                  kobj;
 245         struct rcu_head                 rcu;
 246
 247 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 248         struct bridge_mcast_own_query   ip4_own_query;
 249 #if IS_ENABLED(CONFIG_IPV6)
 250         struct bridge_mcast_own_query   ip6_own_query;
 251 #endif /* IS_ENABLED(CONFIG_IPV6) */
 252         unsigned char                   multicast_router;
 253         struct bridge_mcast_stats       __percpu *mcast_stats;
 254         struct timer_list               multicast_router_timer;
 255         struct hlist_head               mglist;
 256         struct hlist_node               rlist;
 257 #endif
 258
 259 #ifdef CONFIG_SYSFS
 260         char                            sysfs_name[IFNAMSIZ];
 261 #endif
 262
 263 #ifdef CONFIG_NET_POLL_CONTROLLER
 264         struct netpoll                  *np;
 265 #endif
 266 #ifdef CONFIG_NET_SWITCHDEV
 267         int                             offload_fwd_mark;
 268 #endif
 269 };
 270
 271 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 272 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 273
 274 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 275
 276 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 277 {
 278         return rcu_dereference(dev->rx_handler_data);
 279 }
 280
 281 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 282 {
 283         return br_port_exists(dev) ?
 284                 rtnl_dereference(dev->rx_handler_data) : NULL;
 285 }
 286
 287 struct net_bridge {
 288         spinlock_t                      lock;
 289         spinlock_t                      hash_lock;
 290         struct list_head                port_list;
 291         struct net_device               *dev;
 292         struct pcpu_sw_netstats         __percpu *stats;
 293         /* These fields are accessed on each packet */
 294 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 295         u8                              vlan_enabled;
 296         u8                              vlan_stats_enabled;
 297         __be16                          vlan_proto;
 298         u16                             default_pvid;
 299         struct net_bridge_vlan_group    __rcu *vlgrp;
 300 #endif
 301
 302         struct hlist_head               hash[BR_HASH_SIZE];
 303 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 304         union {
 305                 struct rtable           fake_rtable;
 306                 struct rt6_info         fake_rt6_info;
 307         };
 308         bool                            nf_call_iptables;
 309         bool                            nf_call_ip6tables;
 310         bool                            nf_call_arptables;
 311 #endif
 312         u16                             group_fwd_mask;
 313         u16                             group_fwd_mask_required;
 314
 315         /* STP */
 316         bridge_id                       designated_root;
 317         bridge_id                       bridge_id;
 318         u32                             root_path_cost;
 319         unsigned char                   topology_change;
 320         unsigned char                   topology_change_detected;
 321         u16                             root_port;
 322         unsigned long                   max_age;
 323         unsigned long                   hello_time;
 324         unsigned long                   forward_delay;
 325         unsigned long                   ageing_time;
 326         unsigned long                   bridge_max_age;
 327         unsigned long                   bridge_hello_time;
 328         unsigned long                   bridge_forward_delay;
 329         unsigned long                   bridge_ageing_time;
 330
 331         u8                              group_addr[ETH_ALEN];
 332         bool                            group_addr_set;
 333
 334         enum {
 335                 BR_NO_STP,              /* no spanning tree */
 336                 BR_KERNEL_STP,          /* old STP in kernel */
 337                 BR_USER_STP,            /* new RSTP in userspace */
 338         } stp_enabled;
 339
 340 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 341         unsigned char                   multicast_router;
 342
 343         u8                              multicast_disabled:1;
 344         u8                              multicast_querier:1;
 345         u8                              multicast_query_use_ifaddr:1;
 346         u8                              has_ipv6_addr:1;
 347         u8                              multicast_stats_enabled:1;
 348
 349         u32                             hash_elasticity;
 350         u32                             hash_max;
 351
 352         u32                             multicast_last_member_count;
 353         u32                             multicast_startup_query_count;
 354
 355         u8                              multicast_igmp_version;
 356
 357         unsigned long                   multicast_last_member_interval;
 358         unsigned long                   multicast_membership_interval;
 359         unsigned long                   multicast_querier_interval;
 360         unsigned long                   multicast_query_interval;
 361         unsigned long                   multicast_query_response_interval;
 362         unsigned long                   multicast_startup_query_interval;
 363
 364         spinlock_t                      multicast_lock;
 365         struct net_bridge_mdb_htable __rcu *mdb;
 366         struct hlist_head               router_list;
 367
 368         struct timer_list               multicast_router_timer;
 369         struct bridge_mcast_other_query ip4_other_query;
 370         struct bridge_mcast_own_query   ip4_own_query;
 371         struct bridge_mcast_querier     ip4_querier;
 372         struct bridge_mcast_stats       __percpu *mcast_stats;
 373 #if IS_ENABLED(CONFIG_IPV6)
 374         struct bridge_mcast_other_query ip6_other_query;
 375         struct bridge_mcast_own_query   ip6_own_query;
 376         struct bridge_mcast_querier     ip6_querier;
 377         u8                              multicast_mld_version;
 378 #endif /* IS_ENABLED(CONFIG_IPV6) */
 379 #endif
 380
 381         struct timer_list               hello_timer;
 382         struct timer_list               tcn_timer;
 383         struct timer_list               topology_change_timer;
 384         struct delayed_work             gc_work;
 385         struct kobject                  *ifobj;
 386         u32                             auto_cnt;
 387
 388 #ifdef CONFIG_NET_SWITCHDEV
 389         int offload_fwd_mark;
 390 #endif
 391 };
 392
 393 struct br_input_skb_cb {
 394         struct net_device *brdev;
 395
 396 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 397         int igmp;
 398         int mrouters_only;
 399 #endif
 400
 401         bool proxyarp_replied;
 402
 403 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 404         bool vlan_filtered;
 405 #endif
 406
 407 #ifdef CONFIG_NET_SWITCHDEV
 408         int offload_fwd_mark;
 409 #endif
 410 };
 411
 412 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 413
 414 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 415 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 416 #else
 417 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 418 #endif
 419
 420 #define br_printk(level, br, format, args...)   \
 421         printk(level "%s: " format, (br)->dev->name, ##args)
 422
 423 #define br_err(__br, format, args...)                   \
 424         br_printk(KERN_ERR, __br, format, ##args)
 425 #define br_warn(__br, format, args...)                  \
 426         br_printk(KERN_WARNING, __br, format, ##args)
 427 #define br_notice(__br, format, args...)                \
 428         br_printk(KERN_NOTICE, __br, format, ##args)
 429 #define br_info(__br, format, args...)                  \
 430         br_printk(KERN_INFO, __br, format, ##args)
 431
 432 #define br_debug(br, format, args...)                   \
 433         pr_debug("%s: " format,  (br)->dev->name, ##args)
 434
 435 /* called under bridge lock */
 436 static inline int br_is_root_bridge(const struct net_bridge *br)
 437 {
 438         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 439 }
 440
 441 /* check if a VLAN entry is global */
 442 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 443 {
 444         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 445 }
 446
 447 /* check if a VLAN entry is used by the bridge */
 448 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 449 {
 450         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 451 }
 452
 453 /* check if we should use the vlan entry, returns false if it's only context */
 454 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 455 {
 456         if (br_vlan_is_master(v)) {
 457                 if (br_vlan_is_brentry(v))
 458                         return true;
 459                 else
 460                         return false;
 461         }
 462
 463         return true;
 464 }
 465
 466 /* br_device.c */
 467 void br_dev_setup(struct net_device *dev);
 468 void br_dev_delete(struct net_device *dev, struct list_head *list);
 469 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 470 #ifdef CONFIG_NET_POLL_CONTROLLER
 471 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 472                                        struct sk_buff *skb)
 473 {
 474         struct netpoll *np = p->np;
 475
 476         if (np)
 477                 netpoll_send_skb(np, skb);
 478 }
 479
 480 int br_netpoll_enable(struct net_bridge_port *p);
 481 void br_netpoll_disable(struct net_bridge_port *p);
 482 #else
 483 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 484                                        struct sk_buff *skb)
 485 {
 486 }
 487
 488 static inline int br_netpoll_enable(struct net_bridge_port *p)
 489 {
 490         return 0;
 491 }
 492
 493 static inline void br_netpoll_disable(struct net_bridge_port *p)
 494 {
 495 }
 496 #endif
 497
 498 /* br_fdb.c */
 499 int br_fdb_init(void);
 500 void br_fdb_fini(void);
 501 void br_fdb_flush(struct net_bridge *br);
 502 void br_fdb_find_delete_local(struct net_bridge *br,
 503                               const struct net_bridge_port *p,
 504                               const unsigned char *addr, u16 vid);
 505 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 506 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 507 void br_fdb_cleanup(struct work_struct *work);
 508 void br_fdb_delete_by_port(struct net_bridge *br,
 509                            const struct net_bridge_port *p, u16 vid, int do_all);
 510 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 511                                              const unsigned char *addr,
 512                                              __u16 vid);
 513 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 514 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 515                    unsigned long off);
 516 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 517                   const unsigned char *addr, u16 vid);
 518 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 519                    const unsigned char *addr, u16 vid, bool added_by_user);
 520
 521 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 522                   struct net_device *dev, const unsigned char *addr, u16 vid);
 523 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 524                const unsigned char *addr, u16 vid, u16 nlh_flags);
 525 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 526                 struct net_device *dev, struct net_device *fdev, int *idx);
 527 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 528 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 529 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 530                               const unsigned char *addr, u16 vid);
 531 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 532                               const unsigned char *addr, u16 vid);
 533
 534 static inline bool br_hash_lock_held(struct net_bridge *br)
 535 {
 536 #ifdef CONFIG_LOCKDEP
 537         return lockdep_is_held(&br->hash_lock);
 538 #else
 539         return true;
 540 #endif
 541 }
 542
 543 /* br_forward.c */
 544 enum br_pkt_type {
 545         BR_PKT_UNICAST,
 546         BR_PKT_MULTICAST,
 547         BR_PKT_BROADCAST
 548 };
 549 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 550 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 551                 bool local_rcv, bool local_orig);
 552 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 553 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 554               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 555
 556 /* br_if.c */
 557 void br_port_carrier_check(struct net_bridge_port *p);
 558 int br_add_bridge(struct net *net, const char *name);
 559 int br_del_bridge(struct net *net, const char *name);
 560 int br_add_if(struct net_bridge *br, struct net_device *dev);
 561 int br_del_if(struct net_bridge *br, struct net_device *dev);
 562 int br_min_mtu(const struct net_bridge *br);
 563 netdev_features_t br_features_recompute(struct net_bridge *br,
 564                                         netdev_features_t features);
 565 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 566 void br_manage_promisc(struct net_bridge *br);
 567
 568 /* br_input.c */
 569 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 570 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 571
 572 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 573 {
 574         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 575 }
 576
 577 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 578 {
 579         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 580 }
 581
 582 /* br_ioctl.c */
 583 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 584 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 585                              void __user *arg);
 586
 587 /* br_multicast.c */
 588 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 589 extern unsigned int br_mdb_rehash_seq;
 590 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 591                      struct sk_buff *skb, u16 vid);
 592 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 593                                         struct sk_buff *skb, u16 vid);
 594 int br_multicast_add_port(struct net_bridge_port *port);
 595 void br_multicast_del_port(struct net_bridge_port *port);
 596 void br_multicast_enable_port(struct net_bridge_port *port);
 597 void br_multicast_disable_port(struct net_bridge_port *port);
 598 void br_multicast_init(struct net_bridge *br);
 599 void br_multicast_open(struct net_bridge *br);
 600 void br_multicast_stop(struct net_bridge *br);
 601 void br_multicast_dev_del(struct net_bridge *br);
 602 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 603                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 604 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 605 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 606 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 607 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 608 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 609 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 610 #if IS_ENABLED(CONFIG_IPV6)
 611 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 612 #endif
 613 struct net_bridge_mdb_entry *
 614 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 615 struct net_bridge_mdb_entry *
 616 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 617                        struct br_ip *group);
 618 void br_multicast_free_pg(struct rcu_head *head);
 619 struct net_bridge_port_group *
 620 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 621                             struct net_bridge_port_group __rcu *next,
 622                             unsigned char flags, const unsigned char *src);
 623 void br_mdb_init(void);
 624 void br_mdb_uninit(void);
 625 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 626                    struct br_ip *group, int type, u8 flags);
 627 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 628                    int type);
 629 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 630                         const struct sk_buff *skb, u8 type, u8 dir);
 631 int br_multicast_init_stats(struct net_bridge *br);
 632 void br_multicast_get_stats(const struct net_bridge *br,
 633                             const struct net_bridge_port *p,
 634                             struct br_mcast_stats *dest);
 635
 636 #define mlock_dereference(X, br) \
 637         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 638
 639 static inline bool br_multicast_is_router(struct net_bridge *br)
 640 {
 641         return br->multicast_router == 2 ||
 642                (br->multicast_router == 1 &&
 643                 timer_pending(&br->multicast_router_timer));
 644 }
 645
 646 static inline bool
 647 __br_multicast_querier_exists(struct net_bridge *br,
 648                                 struct bridge_mcast_other_query *querier,
 649                                 const bool is_ipv6)
 650 {
 651         bool own_querier_enabled;
 652
 653         if (br->multicast_querier) {
 654                 if (is_ipv6 && !br->has_ipv6_addr)
 655                         own_querier_enabled = false;
 656                 else
 657                         own_querier_enabled = true;
 658         } else {
 659                 own_querier_enabled = false;
 660         }
 661
 662         return time_is_before_jiffies(querier->delay_time) &&
 663                (own_querier_enabled || timer_pending(&querier->timer));
 664 }
 665
 666 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 667                                                struct ethhdr *eth)
 668 {
 669         switch (eth->h_proto) {
 670         case (htons(ETH_P_IP)):
 671                 return __br_multicast_querier_exists(br,
 672                         &br->ip4_other_query, false);
 673 #if IS_ENABLED(CONFIG_IPV6)
 674         case (htons(ETH_P_IPV6)):
 675                 return __br_multicast_querier_exists(br,
 676                         &br->ip6_other_query, true);
 677 #endif
 678         default:
 679                 return false;
 680         }
 681 }
 682
 683 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 684 {
 685         return BR_INPUT_SKB_CB(skb)->igmp;
 686 }
 687 #else
 688 static inline int br_multicast_rcv(struct net_bridge *br,
 689                                    struct net_bridge_port *port,
 690                                    struct sk_buff *skb,
 691                                    u16 vid)
 692 {
 693         return 0;
 694 }
 695
 696 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 697                                                       struct sk_buff *skb, u16 vid)
 698 {
 699         return NULL;
 700 }
 701
 702 static inline int br_multicast_add_port(struct net_bridge_port *port)
 703 {
 704         return 0;
 705 }
 706
 707 static inline void br_multicast_del_port(struct net_bridge_port *port)
 708 {
 709 }
 710
 711 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 712 {
 713 }
 714
 715 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 716 {
 717 }
 718
 719 static inline void br_multicast_init(struct net_bridge *br)
 720 {
 721 }
 722
 723 static inline void br_multicast_open(struct net_bridge *br)
 724 {
 725 }
 726
 727 static inline void br_multicast_stop(struct net_bridge *br)
 728 {
 729 }
 730
 731 static inline void br_multicast_dev_del(struct net_bridge *br)
 732 {
 733 }
 734
 735 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 736                                       struct sk_buff *skb,
 737                                       bool local_rcv, bool local_orig)
 738 {
 739 }
 740
 741 static inline bool br_multicast_is_router(struct net_bridge *br)
 742 {
 743         return 0;
 744 }
 745
 746 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 747                                                struct ethhdr *eth)
 748 {
 749         return false;
 750 }
 751
 752 static inline void br_mdb_init(void)
 753 {
 754 }
 755
 756 static inline void br_mdb_uninit(void)
 757 {
 758 }
 759
 760 static inline void br_multicast_count(struct net_bridge *br,
 761                                       const struct net_bridge_port *p,
 762                                       const struct sk_buff *skb,
 763                                       u8 type, u8 dir)
 764 {
 765 }
 766
 767 static inline int br_multicast_init_stats(struct net_bridge *br)
 768 {
 769         return 0;
 770 }
 771
 772 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 773 {
 774         return 0;
 775 }
 776 #endif
 777
 778 /* br_vlan.c */
 779 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 780 bool br_allowed_ingress(const struct net_bridge *br,
 781                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 782                         u16 *vid);
 783 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 784                        const struct sk_buff *skb);
 785 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 786 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 787                                const struct net_bridge_port *port,
 788                                struct net_bridge_vlan_group *vg,
 789                                struct sk_buff *skb);
 790 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 791 int br_vlan_delete(struct net_bridge *br, u16 vid);
 792 void br_vlan_flush(struct net_bridge *br);
 793 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 794 void br_recalculate_fwd_mask(struct net_bridge *br);
 795 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 796 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 797 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 798 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 799 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 800 int br_vlan_init(struct net_bridge *br);
 801 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 802 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 803 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 804 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 805 void nbp_vlan_flush(struct net_bridge_port *port);
 806 int nbp_vlan_init(struct net_bridge_port *port);
 807 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 808 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 809                        struct br_vlan_stats *stats);
 810
 811 static inline struct net_bridge_vlan_group *br_vlan_group(
 812                                         const struct net_bridge *br)
 813 {
 814         return rtnl_dereference(br->vlgrp);
 815 }
 816
 817 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 818                                         const struct net_bridge_port *p)
 819 {
 820         return rtnl_dereference(p->vlgrp);
 821 }
 822
 823 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 824                                         const struct net_bridge *br)
 825 {
 826         return rcu_dereference(br->vlgrp);
 827 }
 828
 829 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 830                                         const struct net_bridge_port *p)
 831 {
 832         return rcu_dereference(p->vlgrp);
 833 }
 834
 835 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 836  * skb, the vlan tag will always be present if the frame was tagged.
 837  */
 838 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 839 {
 840         int err = 0;
 841
 842         if (skb_vlan_tag_present(skb)) {
 843                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 844         } else {
 845                 *vid = 0;
 846                 err = -EINVAL;
 847         }
 848
 849         return err;
 850 }
 851
 852 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 853 {
 854         if (!vg)
 855                 return 0;
 856
 857         smp_rmb();
 858         return vg->pvid;
 859 }
 860
 861 static inline int br_vlan_enabled(struct net_bridge *br)
 862 {
 863         return br->vlan_enabled;
 864 }
 865 #else
 866 static inline bool br_allowed_ingress(const struct net_bridge *br,
 867                                       struct net_bridge_vlan_group *vg,
 868                                       struct sk_buff *skb,
 869                                       u16 *vid)
 870 {
 871         return true;
 872 }
 873
 874 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 875                                      const struct sk_buff *skb)
 876 {
 877         return true;
 878 }
 879
 880 static inline bool br_should_learn(struct net_bridge_port *p,
 881                                    struct sk_buff *skb, u16 *vid)
 882 {
 883         return true;
 884 }
 885
 886 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 887                                              const struct net_bridge_port *port,
 888                                              struct net_bridge_vlan_group *vg,
 889                                              struct sk_buff *skb)
 890 {
 891         return skb;
 892 }
 893
 894 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 895 {
 896         return -EOPNOTSUPP;
 897 }
 898
 899 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 900 {
 901         return -EOPNOTSUPP;
 902 }
 903
 904 static inline void br_vlan_flush(struct net_bridge *br)
 905 {
 906 }
 907
 908 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 909 {
 910 }
 911
 912 static inline int br_vlan_init(struct net_bridge *br)
 913 {
 914         return 0;
 915 }
 916
 917 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 918 {
 919         return -EOPNOTSUPP;
 920 }
 921
 922 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 923 {
 924         return -EOPNOTSUPP;
 925 }
 926
 927 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 928 {
 929 }
 930
 931 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 932                                                    u16 vid)
 933 {
 934         return NULL;
 935 }
 936
 937 static inline int nbp_vlan_init(struct net_bridge_port *port)
 938 {
 939         return 0;
 940 }
 941
 942 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 943 {
 944         return 0;
 945 }
 946
 947 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 948 {
 949         return 0;
 950 }
 951
 952 static inline int br_vlan_enabled(struct net_bridge *br)
 953 {
 954         return 0;
 955 }
 956
 957 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 958                                           unsigned long val)
 959 {
 960         return -EOPNOTSUPP;
 961 }
 962
 963 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 964                                          u32 filter_mask)
 965 {
 966         return 0;
 967 }
 968
 969 static inline struct net_bridge_vlan_group *br_vlan_group(
 970                                         const struct net_bridge *br)
 971 {
 972         return NULL;
 973 }
 974
 975 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 976                                         const struct net_bridge_port *p)
 977 {
 978         return NULL;
 979 }
 980
 981 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 982                                         const struct net_bridge *br)
 983 {
 984         return NULL;
 985 }
 986
 987 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 988                                         const struct net_bridge_port *p)
 989 {
 990         return NULL;
 991 }
 992
 993 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 994                                      struct br_vlan_stats *stats)
 995 {
 996 }
 997 #endif
 998
 999 struct nf_br_ops {
1000         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1001 };
1002 extern const struct nf_br_ops __rcu *nf_br_ops;
1003
1004 /* br_netfilter.c */
1005 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1006 int br_nf_core_init(void);
1007 void br_nf_core_fini(void);
1008 void br_netfilter_rtable_init(struct net_bridge *);
1009 #else
1010 static inline int br_nf_core_init(void) { return 0; }
1011 static inline void br_nf_core_fini(void) {}
1012 #define br_netfilter_rtable_init(x)
1013 #endif
1014
1015 /* br_stp.c */
1016 void br_set_state(struct net_bridge_port *p, unsigned int state);
1017 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1018 void br_init_port(struct net_bridge_port *p);
1019 void br_become_designated_port(struct net_bridge_port *p);
1020
1021 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1022 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1023 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1024 int br_set_max_age(struct net_bridge *br, unsigned long x);
1025 int __set_ageing_time(struct net_device *dev, unsigned long t);
1026 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1027
1028
1029 /* br_stp_if.c */
1030 void br_stp_enable_bridge(struct net_bridge *br);
1031 void br_stp_disable_bridge(struct net_bridge *br);
1032 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1033 void br_stp_enable_port(struct net_bridge_port *p);
1034 void br_stp_disable_port(struct net_bridge_port *p);
1035 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1036 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1037 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1038 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1039 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1040 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1041
1042 /* br_stp_bpdu.c */
1043 struct stp_proto;
1044 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1045                 struct net_device *dev);
1046
1047 /* br_stp_timer.c */
1048 void br_stp_timer_init(struct net_bridge *br);
1049 void br_stp_port_timer_init(struct net_bridge_port *p);
1050 unsigned long br_timer_value(const struct timer_list *timer);
1051
1052 /* br.c */
1053 #if IS_ENABLED(CONFIG_ATM_LANE)
1054 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1055 #endif
1056
1057 /* br_netlink.c */
1058 extern struct rtnl_link_ops br_link_ops;
1059 int br_netlink_init(void);
1060 void br_netlink_fini(void);
1061 void br_ifinfo_notify(int event, struct net_bridge_port *port);
1062 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1063 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1064 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1065                u32 filter_mask, int nlflags);
1066
1067 #ifdef CONFIG_SYSFS
1068 /* br_sysfs_if.c */
1069 extern const struct sysfs_ops brport_sysfs_ops;
1070 int br_sysfs_addif(struct net_bridge_port *p);
1071 int br_sysfs_renameif(struct net_bridge_port *p);
1072
1073 /* br_sysfs_br.c */
1074 int br_sysfs_addbr(struct net_device *dev);
1075 void br_sysfs_delbr(struct net_device *dev);
1076
1077 #else
1078
1079 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1080 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1081 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1082 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1083 #endif /* CONFIG_SYSFS */
1084
1085 /* br_switchdev.c */
1086 #ifdef CONFIG_NET_SWITCHDEV
1087 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1088 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1089                               struct sk_buff *skb);
1090 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1091                                   const struct sk_buff *skb);
1092 #else
1093 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1094 {
1095         return 0;
1096 }
1097
1098 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1099                                             struct sk_buff *skb)
1100 {
1101 }
1102
1103 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1104                                                 const struct sk_buff *skb)
1105 {
1106         return true;
1107 }
1108 #endif /* CONFIG_NET_SWITCHDEV */
1109
1110 #endif