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 #include <linux/refcount.h>
  25
  26 #define BR_HASH_BITS 8
  27 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  28
  29 #define BR_HOLD_TIME (1*HZ)
  30
  31 #define BR_PORT_BITS    10
  32 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  33
  34 #define BR_VERSION      "2.3"
  35
  36 /* Control of forwarding link local multicast */
  37 #define BR_GROUPFWD_DEFAULT     0
  38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  39 enum {
  40         BR_GROUPFWD_STP         = BIT(0),
  41         BR_GROUPFWD_MACPAUSE    = BIT(1),
  42         BR_GROUPFWD_LACP        = BIT(2),
  43 };
  44
  45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
  46                                 BR_GROUPFWD_LACP)
  47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  48 #define BR_GROUPFWD_8021AD      0xB801u
  49
  50 /* Path to usermode spanning tree program */
  51 #define BR_STP_PROG     "/sbin/bridge-stp"
  52
  53 typedef struct bridge_id bridge_id;
  54 typedef struct mac_addr mac_addr;
  55 typedef __u16 port_id;
  56
  57 struct bridge_id
  58 {
  59         unsigned char   prio[2];
  60         unsigned char   addr[ETH_ALEN];
  61 };
  62
  63 struct mac_addr
  64 {
  65         unsigned char   addr[ETH_ALEN];
  66 };
  67
  68 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  69 /* our own querier */
  70 struct bridge_mcast_own_query {
  71         struct timer_list       timer;
  72         u32                     startup_sent;
  73 };
  74
  75 /* other querier */
  76 struct bridge_mcast_other_query {
  77         struct timer_list               timer;
  78         unsigned long                   delay_time;
  79 };
  80
  81 /* selected querier */
  82 struct bridge_mcast_querier {
  83         struct br_ip addr;
  84         struct net_bridge_port __rcu    *port;
  85 };
  86
  87 /* IGMP/MLD statistics */
  88 struct bridge_mcast_stats {
  89         struct br_mcast_stats mstats;
  90         struct u64_stats_sync syncp;
  91 };
  92 #endif
  93
  94 struct br_vlan_stats {
  95         u64 rx_bytes;
  96         u64 rx_packets;
  97         u64 tx_bytes;
  98         u64 tx_packets;
  99         struct u64_stats_sync syncp;
 100 };
 101
 102 struct br_tunnel_info {
 103         __be64                  tunnel_id;
 104         struct metadata_dst     *tunnel_dst;
 105 };
 106
 107 /**
 108  * struct net_bridge_vlan - per-vlan entry
 109  *
 110  * @vnode: rhashtable member
 111  * @vid: VLAN id
 112  * @flags: bridge vlan flags
 113  * @stats: per-cpu VLAN statistics
 114  * @br: if MASTER flag set, this points to a bridge struct
 115  * @port: if MASTER flag unset, this points to a port struct
 116  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 117  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 118  *          for this VLAN entry
 119  * @vlist: sorted list of VLAN entries
 120  * @rcu: used for entry destruction
 121  *
 122  * This structure is shared between the global per-VLAN entries contained in
 123  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 124  * the port's rhashtable. The union entries should be interpreted depending on
 125  * the entry flags that are set.
 126  */
 127 struct net_bridge_vlan {
 128         struct rhash_head               vnode;
 129         struct rhash_head               tnode;
 130         u16                             vid;
 131         u16                             flags;
 132         struct br_vlan_stats __percpu   *stats;
 133         union {
 134                 struct net_bridge       *br;
 135                 struct net_bridge_port  *port;
 136         };
 137         union {
 138                 refcount_t              refcnt;
 139                 struct net_bridge_vlan  *brvlan;
 140         };
 141
 142         struct br_tunnel_info           tinfo;
 143
 144         struct list_head                vlist;
 145
 146         struct rcu_head                 rcu;
 147 };
 148
 149 /**
 150  * struct net_bridge_vlan_group
 151  *
 152  * @vlan_hash: VLAN entry rhashtable
 153  * @vlan_list: sorted VLAN entry list
 154  * @num_vlans: number of total VLAN entries
 155  * @pvid: PVID VLAN id
 156  *
 157  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 158  *            primitives because the bridge can have entries in its list which
 159  *            are just for global context but not for filtering, i.e. they have
 160  *            the master flag set but not the brentry flag. If you have to check
 161  *            if there're "real" entries in the bridge please test @num_vlans
 162  */
 163 struct net_bridge_vlan_group {
 164         struct rhashtable               vlan_hash;
 165         struct rhashtable               tunnel_hash;
 166         struct list_head                vlan_list;
 167         u16                             num_vlans;
 168         u16                             pvid;
 169 };
 170
 171 struct net_bridge_fdb_entry {
 172         struct hlist_node               hlist;
 173         struct net_bridge_port          *dst;
 174
 175         mac_addr                        addr;
 176         __u16                           vlan_id;
 177         unsigned char                   is_local:1,
 178                                         is_static:1,
 179                                         added_by_user:1,
 180                                         added_by_external_learn:1,
 181                                         offloaded:1;
 182
 183         /* write-heavy members should not affect lookups */
 184         unsigned long                   updated ____cacheline_aligned_in_smp;
 185         unsigned long                   used;
 186
 187         struct rcu_head                 rcu;
 188 };
 189
 190 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 191 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 192
 193 struct net_bridge_port_group {
 194         struct net_bridge_port          *port;
 195         struct net_bridge_port_group __rcu *next;
 196         struct hlist_node               mglist;
 197         struct rcu_head                 rcu;
 198         struct timer_list               timer;
 199         struct br_ip                    addr;
 200         unsigned char                   flags;
 201         unsigned char                   eth_addr[ETH_ALEN];
 202 };
 203
 204 struct net_bridge_mdb_entry
 205 {
 206         struct hlist_node               hlist[2];
 207         struct net_bridge               *br;
 208         struct net_bridge_port_group __rcu *ports;
 209         struct rcu_head                 rcu;
 210         struct timer_list               timer;
 211         struct br_ip                    addr;
 212         bool                            host_joined;
 213 };
 214
 215 struct net_bridge_mdb_htable
 216 {
 217         struct hlist_head               *mhash;
 218         struct rcu_head                 rcu;
 219         struct net_bridge_mdb_htable    *old;
 220         u32                             size;
 221         u32                             max;
 222         u32                             secret;
 223         u32                             ver;
 224 };
 225
 226 struct net_bridge_port {
 227         struct net_bridge               *br;
 228         struct net_device               *dev;
 229         struct list_head                list;
 230
 231         unsigned long                   flags;
 232 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 233         struct net_bridge_vlan_group    __rcu *vlgrp;
 234 #endif
 235
 236         /* STP */
 237         u8                              priority;
 238         u8                              state;
 239         u16                             port_no;
 240         unsigned char                   topology_change_ack;
 241         unsigned char                   config_pending;
 242         port_id                         port_id;
 243         port_id                         designated_port;
 244         bridge_id                       designated_root;
 245         bridge_id                       designated_bridge;
 246         u32                             path_cost;
 247         u32                             designated_cost;
 248         unsigned long                   designated_age;
 249
 250         struct timer_list               forward_delay_timer;
 251         struct timer_list               hold_timer;
 252         struct timer_list               message_age_timer;
 253         struct kobject                  kobj;
 254         struct rcu_head                 rcu;
 255
 256 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 257         struct bridge_mcast_own_query   ip4_own_query;
 258 #if IS_ENABLED(CONFIG_IPV6)
 259         struct bridge_mcast_own_query   ip6_own_query;
 260 #endif /* IS_ENABLED(CONFIG_IPV6) */
 261         unsigned char                   multicast_router;
 262         struct bridge_mcast_stats       __percpu *mcast_stats;
 263         struct timer_list               multicast_router_timer;
 264         struct hlist_head               mglist;
 265         struct hlist_node               rlist;
 266 #endif
 267
 268 #ifdef CONFIG_SYSFS
 269         char                            sysfs_name[IFNAMSIZ];
 270 #endif
 271
 272 #ifdef CONFIG_NET_POLL_CONTROLLER
 273         struct netpoll                  *np;
 274 #endif
 275 #ifdef CONFIG_NET_SWITCHDEV
 276         int                             offload_fwd_mark;
 277 #endif
 278         u16                             group_fwd_mask;
 279 };
 280
 281 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 282 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 283
 284 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 285
 286 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 287 {
 288         return rcu_dereference(dev->rx_handler_data);
 289 }
 290
 291 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 292 {
 293         return br_port_exists(dev) ?
 294                 rtnl_dereference(dev->rx_handler_data) : NULL;
 295 }
 296
 297 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 298 {
 299         return br_port_exists(dev) ?
 300                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 301 }
 302
 303 struct net_bridge {
 304         spinlock_t                      lock;
 305         spinlock_t                      hash_lock;
 306         struct list_head                port_list;
 307         struct net_device               *dev;
 308         struct pcpu_sw_netstats         __percpu *stats;
 309         /* These fields are accessed on each packet */
 310 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 311         u8                              vlan_enabled;
 312         u8                              vlan_stats_enabled;
 313         __be16                          vlan_proto;
 314         u16                             default_pvid;
 315         struct net_bridge_vlan_group    __rcu *vlgrp;
 316 #endif
 317
 318         struct hlist_head               hash[BR_HASH_SIZE];
 319 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 320         union {
 321                 struct rtable           fake_rtable;
 322                 struct rt6_info         fake_rt6_info;
 323         };
 324         bool                            nf_call_iptables;
 325         bool                            nf_call_ip6tables;
 326         bool                            nf_call_arptables;
 327 #endif
 328         u16                             group_fwd_mask;
 329         u16                             group_fwd_mask_required;
 330
 331         /* STP */
 332         bridge_id                       designated_root;
 333         bridge_id                       bridge_id;
 334         u32                             root_path_cost;
 335         unsigned char                   topology_change;
 336         unsigned char                   topology_change_detected;
 337         u16                             root_port;
 338         unsigned long                   max_age;
 339         unsigned long                   hello_time;
 340         unsigned long                   forward_delay;
 341         unsigned long                   ageing_time;
 342         unsigned long                   bridge_max_age;
 343         unsigned long                   bridge_hello_time;
 344         unsigned long                   bridge_forward_delay;
 345         unsigned long                   bridge_ageing_time;
 346
 347         u8                              group_addr[ETH_ALEN];
 348         bool                            group_addr_set;
 349
 350         enum {
 351                 BR_NO_STP,              /* no spanning tree */
 352                 BR_KERNEL_STP,          /* old STP in kernel */
 353                 BR_USER_STP,            /* new RSTP in userspace */
 354         } stp_enabled;
 355
 356 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 357         unsigned char                   multicast_router;
 358
 359         u8                              multicast_disabled:1;
 360         u8                              multicast_querier:1;
 361         u8                              multicast_query_use_ifaddr:1;
 362         u8                              has_ipv6_addr:1;
 363         u8                              multicast_stats_enabled:1;
 364
 365         u32                             hash_elasticity;
 366         u32                             hash_max;
 367
 368         u32                             multicast_last_member_count;
 369         u32                             multicast_startup_query_count;
 370
 371         u8                              multicast_igmp_version;
 372
 373         unsigned long                   multicast_last_member_interval;
 374         unsigned long                   multicast_membership_interval;
 375         unsigned long                   multicast_querier_interval;
 376         unsigned long                   multicast_query_interval;
 377         unsigned long                   multicast_query_response_interval;
 378         unsigned long                   multicast_startup_query_interval;
 379
 380         spinlock_t                      multicast_lock;
 381         struct net_bridge_mdb_htable __rcu *mdb;
 382         struct hlist_head               router_list;
 383
 384         struct timer_list               multicast_router_timer;
 385         struct bridge_mcast_other_query ip4_other_query;
 386         struct bridge_mcast_own_query   ip4_own_query;
 387         struct bridge_mcast_querier     ip4_querier;
 388         struct bridge_mcast_stats       __percpu *mcast_stats;
 389 #if IS_ENABLED(CONFIG_IPV6)
 390         struct bridge_mcast_other_query ip6_other_query;
 391         struct bridge_mcast_own_query   ip6_own_query;
 392         struct bridge_mcast_querier     ip6_querier;
 393         u8                              multicast_mld_version;
 394 #endif /* IS_ENABLED(CONFIG_IPV6) */
 395 #endif
 396
 397         struct timer_list               hello_timer;
 398         struct timer_list               tcn_timer;
 399         struct timer_list               topology_change_timer;
 400         struct delayed_work             gc_work;
 401         struct kobject                  *ifobj;
 402         u32                             auto_cnt;
 403
 404 #ifdef CONFIG_NET_SWITCHDEV
 405         int offload_fwd_mark;
 406 #endif
 407         bool                            neigh_suppress_enabled;
 408 };
 409
 410 struct br_input_skb_cb {
 411         struct net_device *brdev;
 412
 413 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 414         int igmp;
 415         int mrouters_only;
 416 #endif
 417
 418         bool proxyarp_replied;
 419
 420 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 421         bool vlan_filtered;
 422 #endif
 423
 424 #ifdef CONFIG_NET_SWITCHDEV
 425         int offload_fwd_mark;
 426 #endif
 427 };
 428
 429 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 430
 431 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 432 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 433 #else
 434 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 435 #endif
 436
 437 #define br_printk(level, br, format, args...)   \
 438         printk(level "%s: " format, (br)->dev->name, ##args)
 439
 440 #define br_err(__br, format, args...)                   \
 441         br_printk(KERN_ERR, __br, format, ##args)
 442 #define br_warn(__br, format, args...)                  \
 443         br_printk(KERN_WARNING, __br, format, ##args)
 444 #define br_notice(__br, format, args...)                \
 445         br_printk(KERN_NOTICE, __br, format, ##args)
 446 #define br_info(__br, format, args...)                  \
 447         br_printk(KERN_INFO, __br, format, ##args)
 448
 449 #define br_debug(br, format, args...)                   \
 450         pr_debug("%s: " format,  (br)->dev->name, ##args)
 451
 452 /* called under bridge lock */
 453 static inline int br_is_root_bridge(const struct net_bridge *br)
 454 {
 455         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 456 }
 457
 458 /* check if a VLAN entry is global */
 459 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 460 {
 461         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 462 }
 463
 464 /* check if a VLAN entry is used by the bridge */
 465 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 466 {
 467         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 468 }
 469
 470 /* check if we should use the vlan entry, returns false if it's only context */
 471 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 472 {
 473         if (br_vlan_is_master(v)) {
 474                 if (br_vlan_is_brentry(v))
 475                         return true;
 476                 else
 477                         return false;
 478         }
 479
 480         return true;
 481 }
 482
 483 /* br_device.c */
 484 void br_dev_setup(struct net_device *dev);
 485 void br_dev_delete(struct net_device *dev, struct list_head *list);
 486 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 487 #ifdef CONFIG_NET_POLL_CONTROLLER
 488 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 489                                        struct sk_buff *skb)
 490 {
 491         struct netpoll *np = p->np;
 492
 493         if (np)
 494                 netpoll_send_skb(np, skb);
 495 }
 496
 497 int br_netpoll_enable(struct net_bridge_port *p);
 498 void br_netpoll_disable(struct net_bridge_port *p);
 499 #else
 500 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 501                                        struct sk_buff *skb)
 502 {
 503 }
 504
 505 static inline int br_netpoll_enable(struct net_bridge_port *p)
 506 {
 507         return 0;
 508 }
 509
 510 static inline void br_netpoll_disable(struct net_bridge_port *p)
 511 {
 512 }
 513 #endif
 514
 515 /* br_fdb.c */
 516 int br_fdb_init(void);
 517 void br_fdb_fini(void);
 518 void br_fdb_flush(struct net_bridge *br);
 519 void br_fdb_find_delete_local(struct net_bridge *br,
 520                               const struct net_bridge_port *p,
 521                               const unsigned char *addr, u16 vid);
 522 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 523 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 524 void br_fdb_cleanup(struct work_struct *work);
 525 void br_fdb_delete_by_port(struct net_bridge *br,
 526                            const struct net_bridge_port *p, u16 vid, int do_all);
 527 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 528                                              const unsigned char *addr,
 529                                              __u16 vid);
 530 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 531 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 532                    unsigned long off);
 533 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 534                   const unsigned char *addr, u16 vid);
 535 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 536                    const unsigned char *addr, u16 vid, bool added_by_user);
 537
 538 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 539                   struct net_device *dev, const unsigned char *addr, u16 vid);
 540 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 541                const unsigned char *addr, u16 vid, u16 nlh_flags);
 542 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 543                 struct net_device *dev, struct net_device *fdev, int *idx);
 544 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 545 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 546 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 547                               const unsigned char *addr, u16 vid);
 548 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 549                               const unsigned char *addr, u16 vid);
 550 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 551                           const unsigned char *addr, u16 vid);
 552
 553 /* br_forward.c */
 554 enum br_pkt_type {
 555         BR_PKT_UNICAST,
 556         BR_PKT_MULTICAST,
 557         BR_PKT_BROADCAST
 558 };
 559 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 560 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 561                 bool local_rcv, bool local_orig);
 562 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 563 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 564               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 565
 566 /* br_if.c */
 567 void br_port_carrier_check(struct net_bridge_port *p);
 568 int br_add_bridge(struct net *net, const char *name);
 569 int br_del_bridge(struct net *net, const char *name);
 570 int br_add_if(struct net_bridge *br, struct net_device *dev,
 571               struct netlink_ext_ack *extack);
 572 int br_del_if(struct net_bridge *br, struct net_device *dev);
 573 int br_min_mtu(const struct net_bridge *br);
 574 netdev_features_t br_features_recompute(struct net_bridge *br,
 575                                         netdev_features_t features);
 576 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 577 void br_manage_promisc(struct net_bridge *br);
 578
 579 /* br_input.c */
 580 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 581 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 582
 583 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 584 {
 585         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 586 }
 587
 588 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 589 {
 590         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 591 }
 592
 593 /* br_ioctl.c */
 594 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 595 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 596                              void __user *arg);
 597
 598 /* br_multicast.c */
 599 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 600 extern unsigned int br_mdb_rehash_seq;
 601 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 602                      struct sk_buff *skb, u16 vid);
 603 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 604                                         struct sk_buff *skb, u16 vid);
 605 int br_multicast_add_port(struct net_bridge_port *port);
 606 void br_multicast_del_port(struct net_bridge_port *port);
 607 void br_multicast_enable_port(struct net_bridge_port *port);
 608 void br_multicast_disable_port(struct net_bridge_port *port);
 609 void br_multicast_init(struct net_bridge *br);
 610 void br_multicast_open(struct net_bridge *br);
 611 void br_multicast_stop(struct net_bridge *br);
 612 void br_multicast_dev_del(struct net_bridge *br);
 613 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 614                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 615 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 616 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 617 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 618 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 619 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 620 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 621 #if IS_ENABLED(CONFIG_IPV6)
 622 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 623 #endif
 624 struct net_bridge_mdb_entry *
 625 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 626 struct net_bridge_mdb_entry *
 627 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 628                        struct br_ip *group);
 629 void br_multicast_free_pg(struct rcu_head *head);
 630 struct net_bridge_port_group *
 631 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 632                             struct net_bridge_port_group __rcu *next,
 633                             unsigned char flags, const unsigned char *src);
 634 void br_mdb_init(void);
 635 void br_mdb_uninit(void);
 636 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 637                    struct br_ip *group, int type, u8 flags);
 638 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 639                    int type);
 640 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 641                         const struct sk_buff *skb, u8 type, u8 dir);
 642 int br_multicast_init_stats(struct net_bridge *br);
 643 void br_multicast_uninit_stats(struct net_bridge *br);
 644 void br_multicast_get_stats(const struct net_bridge *br,
 645                             const struct net_bridge_port *p,
 646                             struct br_mcast_stats *dest);
 647
 648 #define mlock_dereference(X, br) \
 649         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 650
 651 static inline bool br_multicast_is_router(struct net_bridge *br)
 652 {
 653         return br->multicast_router == 2 ||
 654                (br->multicast_router == 1 &&
 655                 timer_pending(&br->multicast_router_timer));
 656 }
 657
 658 static inline bool
 659 __br_multicast_querier_exists(struct net_bridge *br,
 660                                 struct bridge_mcast_other_query *querier,
 661                                 const bool is_ipv6)
 662 {
 663         bool own_querier_enabled;
 664
 665         if (br->multicast_querier) {
 666                 if (is_ipv6 && !br->has_ipv6_addr)
 667                         own_querier_enabled = false;
 668                 else
 669                         own_querier_enabled = true;
 670         } else {
 671                 own_querier_enabled = false;
 672         }
 673
 674         return time_is_before_jiffies(querier->delay_time) &&
 675                (own_querier_enabled || timer_pending(&querier->timer));
 676 }
 677
 678 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 679                                                struct ethhdr *eth)
 680 {
 681         switch (eth->h_proto) {
 682         case (htons(ETH_P_IP)):
 683                 return __br_multicast_querier_exists(br,
 684                         &br->ip4_other_query, false);
 685 #if IS_ENABLED(CONFIG_IPV6)
 686         case (htons(ETH_P_IPV6)):
 687                 return __br_multicast_querier_exists(br,
 688                         &br->ip6_other_query, true);
 689 #endif
 690         default:
 691                 return false;
 692         }
 693 }
 694
 695 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 696 {
 697         return BR_INPUT_SKB_CB(skb)->igmp;
 698 }
 699 #else
 700 static inline int br_multicast_rcv(struct net_bridge *br,
 701                                    struct net_bridge_port *port,
 702                                    struct sk_buff *skb,
 703                                    u16 vid)
 704 {
 705         return 0;
 706 }
 707
 708 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 709                                                       struct sk_buff *skb, u16 vid)
 710 {
 711         return NULL;
 712 }
 713
 714 static inline int br_multicast_add_port(struct net_bridge_port *port)
 715 {
 716         return 0;
 717 }
 718
 719 static inline void br_multicast_del_port(struct net_bridge_port *port)
 720 {
 721 }
 722
 723 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 724 {
 725 }
 726
 727 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 728 {
 729 }
 730
 731 static inline void br_multicast_init(struct net_bridge *br)
 732 {
 733 }
 734
 735 static inline void br_multicast_open(struct net_bridge *br)
 736 {
 737 }
 738
 739 static inline void br_multicast_stop(struct net_bridge *br)
 740 {
 741 }
 742
 743 static inline void br_multicast_dev_del(struct net_bridge *br)
 744 {
 745 }
 746
 747 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 748                                       struct sk_buff *skb,
 749                                       bool local_rcv, bool local_orig)
 750 {
 751 }
 752
 753 static inline bool br_multicast_is_router(struct net_bridge *br)
 754 {
 755         return 0;
 756 }
 757
 758 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 759                                                struct ethhdr *eth)
 760 {
 761         return false;
 762 }
 763
 764 static inline void br_mdb_init(void)
 765 {
 766 }
 767
 768 static inline void br_mdb_uninit(void)
 769 {
 770 }
 771
 772 static inline void br_multicast_count(struct net_bridge *br,
 773                                       const struct net_bridge_port *p,
 774                                       const struct sk_buff *skb,
 775                                       u8 type, u8 dir)
 776 {
 777 }
 778
 779 static inline int br_multicast_init_stats(struct net_bridge *br)
 780 {
 781         return 0;
 782 }
 783
 784 static inline void br_multicast_uninit_stats(struct net_bridge *br)
 785 {
 786 }
 787
 788 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 789 {
 790         return 0;
 791 }
 792 #endif
 793
 794 /* br_vlan.c */
 795 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 796 bool br_allowed_ingress(const struct net_bridge *br,
 797                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 798                         u16 *vid);
 799 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 800                        const struct sk_buff *skb);
 801 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 802 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 803                                const struct net_bridge_port *port,
 804                                struct net_bridge_vlan_group *vg,
 805                                struct sk_buff *skb);
 806 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 807                 bool *changed);
 808 int br_vlan_delete(struct net_bridge *br, u16 vid);
 809 void br_vlan_flush(struct net_bridge *br);
 810 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 811 void br_recalculate_fwd_mask(struct net_bridge *br);
 812 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 813 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 814 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 815 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 816 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 817 int br_vlan_init(struct net_bridge *br);
 818 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 819 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 820 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 821                  bool *changed);
 822 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 823 void nbp_vlan_flush(struct net_bridge_port *port);
 824 int nbp_vlan_init(struct net_bridge_port *port);
 825 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 826 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 827                        struct br_vlan_stats *stats);
 828
 829 static inline struct net_bridge_vlan_group *br_vlan_group(
 830                                         const struct net_bridge *br)
 831 {
 832         return rtnl_dereference(br->vlgrp);
 833 }
 834
 835 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 836                                         const struct net_bridge_port *p)
 837 {
 838         return rtnl_dereference(p->vlgrp);
 839 }
 840
 841 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 842                                         const struct net_bridge *br)
 843 {
 844         return rcu_dereference(br->vlgrp);
 845 }
 846
 847 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 848                                         const struct net_bridge_port *p)
 849 {
 850         return rcu_dereference(p->vlgrp);
 851 }
 852
 853 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 854  * skb, the vlan tag will always be present if the frame was tagged.
 855  */
 856 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 857 {
 858         int err = 0;
 859
 860         if (skb_vlan_tag_present(skb)) {
 861                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 862         } else {
 863                 *vid = 0;
 864                 err = -EINVAL;
 865         }
 866
 867         return err;
 868 }
 869
 870 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 871 {
 872         if (!vg)
 873                 return 0;
 874
 875         smp_rmb();
 876         return vg->pvid;
 877 }
 878
 879 #else
 880 static inline bool br_allowed_ingress(const struct net_bridge *br,
 881                                       struct net_bridge_vlan_group *vg,
 882                                       struct sk_buff *skb,
 883                                       u16 *vid)
 884 {
 885         return true;
 886 }
 887
 888 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 889                                      const struct sk_buff *skb)
 890 {
 891         return true;
 892 }
 893
 894 static inline bool br_should_learn(struct net_bridge_port *p,
 895                                    struct sk_buff *skb, u16 *vid)
 896 {
 897         return true;
 898 }
 899
 900 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 901                                              const struct net_bridge_port *port,
 902                                              struct net_bridge_vlan_group *vg,
 903                                              struct sk_buff *skb)
 904 {
 905         return skb;
 906 }
 907
 908 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 909                               bool *changed)
 910 {
 911         *changed = false;
 912         return -EOPNOTSUPP;
 913 }
 914
 915 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 916 {
 917         return -EOPNOTSUPP;
 918 }
 919
 920 static inline void br_vlan_flush(struct net_bridge *br)
 921 {
 922 }
 923
 924 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 925 {
 926 }
 927
 928 static inline int br_vlan_init(struct net_bridge *br)
 929 {
 930         return 0;
 931 }
 932
 933 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 934                                bool *changed)
 935 {
 936         *changed = false;
 937         return -EOPNOTSUPP;
 938 }
 939
 940 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 941 {
 942         return -EOPNOTSUPP;
 943 }
 944
 945 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 946 {
 947 }
 948
 949 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 950                                                    u16 vid)
 951 {
 952         return NULL;
 953 }
 954
 955 static inline int nbp_vlan_init(struct net_bridge_port *port)
 956 {
 957         return 0;
 958 }
 959
 960 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 961 {
 962         return 0;
 963 }
 964
 965 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 966 {
 967         return 0;
 968 }
 969
 970 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 971                                           unsigned long val)
 972 {
 973         return -EOPNOTSUPP;
 974 }
 975
 976 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 977                                          u32 filter_mask)
 978 {
 979         return 0;
 980 }
 981
 982 static inline struct net_bridge_vlan_group *br_vlan_group(
 983                                         const struct net_bridge *br)
 984 {
 985         return NULL;
 986 }
 987
 988 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 989                                         const struct net_bridge_port *p)
 990 {
 991         return NULL;
 992 }
 993
 994 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 995                                         const struct net_bridge *br)
 996 {
 997         return NULL;
 998 }
 999
1000 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1001                                         const struct net_bridge_port *p)
1002 {
1003         return NULL;
1004 }
1005
1006 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1007                                      struct br_vlan_stats *stats)
1008 {
1009 }
1010 #endif
1011
1012 struct nf_br_ops {
1013         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1014 };
1015 extern const struct nf_br_ops __rcu *nf_br_ops;
1016
1017 /* br_netfilter.c */
1018 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1019 int br_nf_core_init(void);
1020 void br_nf_core_fini(void);
1021 void br_netfilter_rtable_init(struct net_bridge *);
1022 #else
1023 static inline int br_nf_core_init(void) { return 0; }
1024 static inline void br_nf_core_fini(void) {}
1025 #define br_netfilter_rtable_init(x)
1026 #endif
1027
1028 /* br_stp.c */
1029 void br_set_state(struct net_bridge_port *p, unsigned int state);
1030 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1031 void br_init_port(struct net_bridge_port *p);
1032 void br_become_designated_port(struct net_bridge_port *p);
1033
1034 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1035 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1036 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1037 int br_set_max_age(struct net_bridge *br, unsigned long x);
1038 int __set_ageing_time(struct net_device *dev, unsigned long t);
1039 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1040
1041
1042 /* br_stp_if.c */
1043 void br_stp_enable_bridge(struct net_bridge *br);
1044 void br_stp_disable_bridge(struct net_bridge *br);
1045 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1046 void br_stp_enable_port(struct net_bridge_port *p);
1047 void br_stp_disable_port(struct net_bridge_port *p);
1048 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1049 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1050 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1051 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1052 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1053 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1054
1055 /* br_stp_bpdu.c */
1056 struct stp_proto;
1057 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1058                 struct net_device *dev);
1059
1060 /* br_stp_timer.c */
1061 void br_stp_timer_init(struct net_bridge *br);
1062 void br_stp_port_timer_init(struct net_bridge_port *p);
1063 unsigned long br_timer_value(const struct timer_list *timer);
1064
1065 /* br.c */
1066 #if IS_ENABLED(CONFIG_ATM_LANE)
1067 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1068 #endif
1069
1070 /* br_netlink.c */
1071 extern struct rtnl_link_ops br_link_ops;
1072 int br_netlink_init(void);
1073 void br_netlink_fini(void);
1074 void br_ifinfo_notify(int event, const struct net_bridge *br,
1075                       const struct net_bridge_port *port);
1076 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1077 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1078 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1079                u32 filter_mask, int nlflags);
1080
1081 #ifdef CONFIG_SYSFS
1082 /* br_sysfs_if.c */
1083 extern const struct sysfs_ops brport_sysfs_ops;
1084 int br_sysfs_addif(struct net_bridge_port *p);
1085 int br_sysfs_renameif(struct net_bridge_port *p);
1086
1087 /* br_sysfs_br.c */
1088 int br_sysfs_addbr(struct net_device *dev);
1089 void br_sysfs_delbr(struct net_device *dev);
1090
1091 #else
1092
1093 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1094 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1095 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1096 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1097 #endif /* CONFIG_SYSFS */
1098
1099 /* br_switchdev.c */
1100 #ifdef CONFIG_NET_SWITCHDEV
1101 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1102 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1103                               struct sk_buff *skb);
1104 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1105                                   const struct sk_buff *skb);
1106 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1107                                unsigned long flags,
1108                                unsigned long mask);
1109 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1110                              int type);
1111
1112 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1113 {
1114         skb->offload_fwd_mark = 0;
1115 }
1116 #else
1117 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1118 {
1119         return 0;
1120 }
1121
1122 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1123                                             struct sk_buff *skb)
1124 {
1125 }
1126
1127 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1128                                                 const struct sk_buff *skb)
1129 {
1130         return true;
1131 }
1132
1133 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1134                                              unsigned long flags,
1135                                              unsigned long mask)
1136 {
1137         return 0;
1138 }
1139
1140 static inline void
1141 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1142 {
1143 }
1144
1145 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1146 {
1147 }
1148 #endif /* CONFIG_NET_SWITCHDEV */
1149
1150 /* br_arp_nd_proxy.c */
1151 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1152 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1153                               u16 vid, struct net_bridge_port *p);
1154 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1155                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1156 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1157 #endif