git.rot13.org Git - linux/blob - 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_key {
 172         mac_addr addr;
 173         u16 vlan_id;
 174 };
 175
 176 struct net_bridge_fdb_entry {
 177         struct rhash_head               rhnode;
 178         struct net_bridge_port          *dst;
 179
 180         struct net_bridge_fdb_key       key;
 181         struct hlist_node               fdb_node;
 182         unsigned char                   is_local:1,
 183                                         is_static:1,
 184                                         added_by_user:1,
 185                                         added_by_external_learn:1,
 186                                         offloaded:1;
 187
 188         /* write-heavy members should not affect lookups */
 189         unsigned long                   updated ____cacheline_aligned_in_smp;
 190         unsigned long                   used;
 191
 192         struct rcu_head                 rcu;
 193 };
 194
 195 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 196 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 197
 198 struct net_bridge_port_group {
 199         struct net_bridge_port          *port;
 200         struct net_bridge_port_group __rcu *next;
 201         struct hlist_node               mglist;
 202         struct rcu_head                 rcu;
 203         struct timer_list               timer;
 204         struct br_ip                    addr;
 205         unsigned char                   flags;
 206         unsigned char                   eth_addr[ETH_ALEN];
 207 };
 208
 209 struct net_bridge_mdb_entry
 210 {
 211         struct hlist_node               hlist[2];
 212         struct net_bridge               *br;
 213         struct net_bridge_port_group __rcu *ports;
 214         struct rcu_head                 rcu;
 215         struct timer_list               timer;
 216         struct br_ip                    addr;
 217         bool                            host_joined;
 218 };
 219
 220 struct net_bridge_mdb_htable
 221 {
 222         struct hlist_head               *mhash;
 223         struct rcu_head                 rcu;
 224         struct net_bridge_mdb_htable    *old;
 225         u32                             size;
 226         u32                             max;
 227         u32                             secret;
 228         u32                             ver;
 229 };
 230
 231 struct net_bridge_port {
 232         struct net_bridge               *br;
 233         struct net_device               *dev;
 234         struct list_head                list;
 235
 236         unsigned long                   flags;
 237 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 238         struct net_bridge_vlan_group    __rcu *vlgrp;
 239 #endif
 240
 241         /* STP */
 242         u8                              priority;
 243         u8                              state;
 244         u16                             port_no;
 245         unsigned char                   topology_change_ack;
 246         unsigned char                   config_pending;
 247         port_id                         port_id;
 248         port_id                         designated_port;
 249         bridge_id                       designated_root;
 250         bridge_id                       designated_bridge;
 251         u32                             path_cost;
 252         u32                             designated_cost;
 253         unsigned long                   designated_age;
 254
 255         struct timer_list               forward_delay_timer;
 256         struct timer_list               hold_timer;
 257         struct timer_list               message_age_timer;
 258         struct kobject                  kobj;
 259         struct rcu_head                 rcu;
 260
 261 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 262         struct bridge_mcast_own_query   ip4_own_query;
 263 #if IS_ENABLED(CONFIG_IPV6)
 264         struct bridge_mcast_own_query   ip6_own_query;
 265 #endif /* IS_ENABLED(CONFIG_IPV6) */
 266         unsigned char                   multicast_router;
 267         struct bridge_mcast_stats       __percpu *mcast_stats;
 268         struct timer_list               multicast_router_timer;
 269         struct hlist_head               mglist;
 270         struct hlist_node               rlist;
 271 #endif
 272
 273 #ifdef CONFIG_SYSFS
 274         char                            sysfs_name[IFNAMSIZ];
 275 #endif
 276
 277 #ifdef CONFIG_NET_POLL_CONTROLLER
 278         struct netpoll                  *np;
 279 #endif
 280 #ifdef CONFIG_NET_SWITCHDEV
 281         int                             offload_fwd_mark;
 282 #endif
 283         u16                             group_fwd_mask;
 284 };
 285
 286 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 287 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 288
 289 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 290
 291 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 292 {
 293         return rcu_dereference(dev->rx_handler_data);
 294 }
 295
 296 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 297 {
 298         return br_port_exists(dev) ?
 299                 rtnl_dereference(dev->rx_handler_data) : NULL;
 300 }
 301
 302 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 303 {
 304         return br_port_exists(dev) ?
 305                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 306 }
 307
 308 struct net_bridge {
 309         spinlock_t                      lock;
 310         spinlock_t                      hash_lock;
 311         struct list_head                port_list;
 312         struct net_device               *dev;
 313         struct pcpu_sw_netstats         __percpu *stats;
 314         /* These fields are accessed on each packet */
 315 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 316         u8                              vlan_enabled;
 317         u8                              vlan_stats_enabled;
 318         __be16                          vlan_proto;
 319         u16                             default_pvid;
 320         struct net_bridge_vlan_group    __rcu *vlgrp;
 321 #endif
 322
 323         struct rhashtable               fdb_hash_tbl;
 324 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 325         union {
 326                 struct rtable           fake_rtable;
 327                 struct rt6_info         fake_rt6_info;
 328         };
 329         bool                            nf_call_iptables;
 330         bool                            nf_call_ip6tables;
 331         bool                            nf_call_arptables;
 332 #endif
 333         u16                             group_fwd_mask;
 334         u16                             group_fwd_mask_required;
 335
 336         /* STP */
 337         bridge_id                       designated_root;
 338         bridge_id                       bridge_id;
 339         u32                             root_path_cost;
 340         unsigned char                   topology_change;
 341         unsigned char                   topology_change_detected;
 342         u16                             root_port;
 343         unsigned long                   max_age;
 344         unsigned long                   hello_time;
 345         unsigned long                   forward_delay;
 346         unsigned long                   ageing_time;
 347         unsigned long                   bridge_max_age;
 348         unsigned long                   bridge_hello_time;
 349         unsigned long                   bridge_forward_delay;
 350         unsigned long                   bridge_ageing_time;
 351
 352         u8                              group_addr[ETH_ALEN];
 353         bool                            group_addr_set;
 354
 355         enum {
 356                 BR_NO_STP,              /* no spanning tree */
 357                 BR_KERNEL_STP,          /* old STP in kernel */
 358                 BR_USER_STP,            /* new RSTP in userspace */
 359         } stp_enabled;
 360
 361 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 362         unsigned char                   multicast_router;
 363
 364         u8                              multicast_disabled:1;
 365         u8                              multicast_querier:1;
 366         u8                              multicast_query_use_ifaddr:1;
 367         u8                              has_ipv6_addr:1;
 368         u8                              multicast_stats_enabled:1;
 369
 370         u32                             hash_elasticity;
 371         u32                             hash_max;
 372
 373         u32                             multicast_last_member_count;
 374         u32                             multicast_startup_query_count;
 375
 376         u8                              multicast_igmp_version;
 377
 378         unsigned long                   multicast_last_member_interval;
 379         unsigned long                   multicast_membership_interval;
 380         unsigned long                   multicast_querier_interval;
 381         unsigned long                   multicast_query_interval;
 382         unsigned long                   multicast_query_response_interval;
 383         unsigned long                   multicast_startup_query_interval;
 384
 385         spinlock_t                      multicast_lock;
 386         struct net_bridge_mdb_htable __rcu *mdb;
 387         struct hlist_head               router_list;
 388
 389         struct timer_list               multicast_router_timer;
 390         struct bridge_mcast_other_query ip4_other_query;
 391         struct bridge_mcast_own_query   ip4_own_query;
 392         struct bridge_mcast_querier     ip4_querier;
 393         struct bridge_mcast_stats       __percpu *mcast_stats;
 394 #if IS_ENABLED(CONFIG_IPV6)
 395         struct bridge_mcast_other_query ip6_other_query;
 396         struct bridge_mcast_own_query   ip6_own_query;
 397         struct bridge_mcast_querier     ip6_querier;
 398         u8                              multicast_mld_version;
 399 #endif /* IS_ENABLED(CONFIG_IPV6) */
 400 #endif
 401
 402         struct timer_list               hello_timer;
 403         struct timer_list               tcn_timer;
 404         struct timer_list               topology_change_timer;
 405         struct delayed_work             gc_work;
 406         struct kobject                  *ifobj;
 407         u32                             auto_cnt;
 408
 409 #ifdef CONFIG_NET_SWITCHDEV
 410         int offload_fwd_mark;
 411 #endif
 412         bool                            neigh_suppress_enabled;
 413         bool                            mtu_set_by_user;
 414         struct hlist_head               fdb_list;
 415 };
 416
 417 struct br_input_skb_cb {
 418         struct net_device *brdev;
 419
 420 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 421         int igmp;
 422         int mrouters_only;
 423 #endif
 424
 425         bool proxyarp_replied;
 426         bool src_port_isolated;
 427
 428 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 429         bool vlan_filtered;
 430 #endif
 431
 432 #ifdef CONFIG_NET_SWITCHDEV
 433         int offload_fwd_mark;
 434 #endif
 435 };
 436
 437 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 438
 439 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 440 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 441 #else
 442 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 443 #endif
 444
 445 #define br_printk(level, br, format, args...)   \
 446         printk(level "%s: " format, (br)->dev->name, ##args)
 447
 448 #define br_err(__br, format, args...)                   \
 449         br_printk(KERN_ERR, __br, format, ##args)
 450 #define br_warn(__br, format, args...)                  \
 451         br_printk(KERN_WARNING, __br, format, ##args)
 452 #define br_notice(__br, format, args...)                \
 453         br_printk(KERN_NOTICE, __br, format, ##args)
 454 #define br_info(__br, format, args...)                  \
 455         br_printk(KERN_INFO, __br, format, ##args)
 456
 457 #define br_debug(br, format, args...)                   \
 458         pr_debug("%s: " format,  (br)->dev->name, ##args)
 459
 460 /* called under bridge lock */
 461 static inline int br_is_root_bridge(const struct net_bridge *br)
 462 {
 463         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 464 }
 465
 466 /* check if a VLAN entry is global */
 467 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 468 {
 469         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 470 }
 471
 472 /* check if a VLAN entry is used by the bridge */
 473 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 474 {
 475         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 476 }
 477
 478 /* check if we should use the vlan entry, returns false if it's only context */
 479 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 480 {
 481         if (br_vlan_is_master(v)) {
 482                 if (br_vlan_is_brentry(v))
 483                         return true;
 484                 else
 485                         return false;
 486         }
 487
 488         return true;
 489 }
 490
 491 /* br_device.c */
 492 void br_dev_setup(struct net_device *dev);
 493 void br_dev_delete(struct net_device *dev, struct list_head *list);
 494 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 495 #ifdef CONFIG_NET_POLL_CONTROLLER
 496 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 497                                        struct sk_buff *skb)
 498 {
 499         struct netpoll *np = p->np;
 500
 501         if (np)
 502                 netpoll_send_skb(np, skb);
 503 }
 504
 505 int br_netpoll_enable(struct net_bridge_port *p);
 506 void br_netpoll_disable(struct net_bridge_port *p);
 507 #else
 508 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 509                                        struct sk_buff *skb)
 510 {
 511 }
 512
 513 static inline int br_netpoll_enable(struct net_bridge_port *p)
 514 {
 515         return 0;
 516 }
 517
 518 static inline void br_netpoll_disable(struct net_bridge_port *p)
 519 {
 520 }
 521 #endif
 522
 523 /* br_fdb.c */
 524 int br_fdb_init(void);
 525 void br_fdb_fini(void);
 526 int br_fdb_hash_init(struct net_bridge *br);
 527 void br_fdb_hash_fini(struct net_bridge *br);
 528 void br_fdb_flush(struct net_bridge *br);
 529 void br_fdb_find_delete_local(struct net_bridge *br,
 530                               const struct net_bridge_port *p,
 531                               const unsigned char *addr, u16 vid);
 532 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 533 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 534 void br_fdb_cleanup(struct work_struct *work);
 535 void br_fdb_delete_by_port(struct net_bridge *br,
 536                            const struct net_bridge_port *p, u16 vid, int do_all);
 537 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 538                                              const unsigned char *addr,
 539                                              __u16 vid);
 540 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 541 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 542                    unsigned long off);
 543 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 544                   const unsigned char *addr, u16 vid);
 545 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 546                    const unsigned char *addr, u16 vid, bool added_by_user);
 547
 548 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 549                   struct net_device *dev, const unsigned char *addr, u16 vid);
 550 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 551                const unsigned char *addr, u16 vid, u16 nlh_flags);
 552 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 553                 struct net_device *dev, struct net_device *fdev, int *idx);
 554 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 555 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 556 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 557                               const unsigned char *addr, u16 vid,
 558                               bool swdev_notify);
 559 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 560                               const unsigned char *addr, u16 vid,
 561                               bool swdev_notify);
 562 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 563                           const unsigned char *addr, u16 vid);
 564
 565 /* br_forward.c */
 566 enum br_pkt_type {
 567         BR_PKT_UNICAST,
 568         BR_PKT_MULTICAST,
 569         BR_PKT_BROADCAST
 570 };
 571 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 572 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 573                 bool local_rcv, bool local_orig);
 574 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 575 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 576               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 577
 578 /* return true if both source port and dest port are isolated */
 579 static inline bool br_skb_isolated(const struct net_bridge_port *to,
 580                                    const struct sk_buff *skb)
 581 {
 582         return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
 583                (to->flags & BR_ISOLATED);
 584 }
 585
 586 /* br_if.c */
 587 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
 588 int br_add_bridge(struct net *net, const char *name);
 589 int br_del_bridge(struct net *net, const char *name);
 590 int br_add_if(struct net_bridge *br, struct net_device *dev,
 591               struct netlink_ext_ack *extack);
 592 int br_del_if(struct net_bridge *br, struct net_device *dev);
 593 void br_mtu_auto_adjust(struct net_bridge *br);
 594 netdev_features_t br_features_recompute(struct net_bridge *br,
 595                                         netdev_features_t features);
 596 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 597 void br_manage_promisc(struct net_bridge *br);
 598
 599 /* br_input.c */
 600 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 601 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 602
 603 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 604 {
 605         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 606 }
 607
 608 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
 609 {
 610         return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
 611 }
 612
 613 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 614 {
 615         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 616 }
 617
 618 static inline struct net_bridge_port *
 619 br_port_get_check_rtnl(const struct net_device *dev)
 620 {
 621         return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
 622 }
 623
 624 /* br_ioctl.c */
 625 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 626 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 627                              void __user *arg);
 628
 629 /* br_multicast.c */
 630 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 631 extern unsigned int br_mdb_rehash_seq;
 632 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 633                      struct sk_buff *skb, u16 vid);
 634 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 635                                         struct sk_buff *skb, u16 vid);
 636 int br_multicast_add_port(struct net_bridge_port *port);
 637 void br_multicast_del_port(struct net_bridge_port *port);
 638 void br_multicast_enable_port(struct net_bridge_port *port);
 639 void br_multicast_disable_port(struct net_bridge_port *port);
 640 void br_multicast_init(struct net_bridge *br);
 641 void br_multicast_open(struct net_bridge *br);
 642 void br_multicast_stop(struct net_bridge *br);
 643 void br_multicast_dev_del(struct net_bridge *br);
 644 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 645                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 646 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 647 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 648 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 649 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 650 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 651 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 652 #if IS_ENABLED(CONFIG_IPV6)
 653 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 654 #endif
 655 struct net_bridge_mdb_entry *
 656 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 657 struct net_bridge_mdb_entry *
 658 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 659                        struct br_ip *group);
 660 void br_multicast_free_pg(struct rcu_head *head);
 661 struct net_bridge_port_group *
 662 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 663                             struct net_bridge_port_group __rcu *next,
 664                             unsigned char flags, const unsigned char *src);
 665 void br_mdb_init(void);
 666 void br_mdb_uninit(void);
 667 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 668                    struct br_ip *group, int type, u8 flags);
 669 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 670                    int type);
 671 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 672                         const struct sk_buff *skb, u8 type, u8 dir);
 673 int br_multicast_init_stats(struct net_bridge *br);
 674 void br_multicast_uninit_stats(struct net_bridge *br);
 675 void br_multicast_get_stats(const struct net_bridge *br,
 676                             const struct net_bridge_port *p,
 677                             struct br_mcast_stats *dest);
 678
 679 #define mlock_dereference(X, br) \
 680         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 681
 682 static inline bool br_multicast_is_router(struct net_bridge *br)
 683 {
 684         return br->multicast_router == 2 ||
 685                (br->multicast_router == 1 &&
 686                 timer_pending(&br->multicast_router_timer));
 687 }
 688
 689 static inline bool
 690 __br_multicast_querier_exists(struct net_bridge *br,
 691                                 struct bridge_mcast_other_query *querier,
 692                                 const bool is_ipv6)
 693 {
 694         bool own_querier_enabled;
 695
 696         if (br->multicast_querier) {
 697                 if (is_ipv6 && !br->has_ipv6_addr)
 698                         own_querier_enabled = false;
 699                 else
 700                         own_querier_enabled = true;
 701         } else {
 702                 own_querier_enabled = false;
 703         }
 704
 705         return time_is_before_jiffies(querier->delay_time) &&
 706                (own_querier_enabled || timer_pending(&querier->timer));
 707 }
 708
 709 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 710                                                struct ethhdr *eth)
 711 {
 712         switch (eth->h_proto) {
 713         case (htons(ETH_P_IP)):
 714                 return __br_multicast_querier_exists(br,
 715                         &br->ip4_other_query, false);
 716 #if IS_ENABLED(CONFIG_IPV6)
 717         case (htons(ETH_P_IPV6)):
 718                 return __br_multicast_querier_exists(br,
 719                         &br->ip6_other_query, true);
 720 #endif
 721         default:
 722                 return false;
 723         }
 724 }
 725
 726 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 727 {
 728         return BR_INPUT_SKB_CB(skb)->igmp;
 729 }
 730 #else
 731 static inline int br_multicast_rcv(struct net_bridge *br,
 732                                    struct net_bridge_port *port,
 733                                    struct sk_buff *skb,
 734                                    u16 vid)
 735 {
 736         return 0;
 737 }
 738
 739 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 740                                                       struct sk_buff *skb, u16 vid)
 741 {
 742         return NULL;
 743 }
 744
 745 static inline int br_multicast_add_port(struct net_bridge_port *port)
 746 {
 747         return 0;
 748 }
 749
 750 static inline void br_multicast_del_port(struct net_bridge_port *port)
 751 {
 752 }
 753
 754 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 755 {
 756 }
 757
 758 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 759 {
 760 }
 761
 762 static inline void br_multicast_init(struct net_bridge *br)
 763 {
 764 }
 765
 766 static inline void br_multicast_open(struct net_bridge *br)
 767 {
 768 }
 769
 770 static inline void br_multicast_stop(struct net_bridge *br)
 771 {
 772 }
 773
 774 static inline void br_multicast_dev_del(struct net_bridge *br)
 775 {
 776 }
 777
 778 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 779                                       struct sk_buff *skb,
 780                                       bool local_rcv, bool local_orig)
 781 {
 782 }
 783
 784 static inline bool br_multicast_is_router(struct net_bridge *br)
 785 {
 786         return false;
 787 }
 788
 789 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 790                                                struct ethhdr *eth)
 791 {
 792         return false;
 793 }
 794
 795 static inline void br_mdb_init(void)
 796 {
 797 }
 798
 799 static inline void br_mdb_uninit(void)
 800 {
 801 }
 802
 803 static inline void br_multicast_count(struct net_bridge *br,
 804                                       const struct net_bridge_port *p,
 805                                       const struct sk_buff *skb,
 806                                       u8 type, u8 dir)
 807 {
 808 }
 809
 810 static inline int br_multicast_init_stats(struct net_bridge *br)
 811 {
 812         return 0;
 813 }
 814
 815 static inline void br_multicast_uninit_stats(struct net_bridge *br)
 816 {
 817 }
 818
 819 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 820 {
 821         return 0;
 822 }
 823 #endif
 824
 825 /* br_vlan.c */
 826 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 827 bool br_allowed_ingress(const struct net_bridge *br,
 828                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 829                         u16 *vid);
 830 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 831                        const struct sk_buff *skb);
 832 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 833 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 834                                const struct net_bridge_port *port,
 835                                struct net_bridge_vlan_group *vg,
 836                                struct sk_buff *skb);
 837 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 838                 bool *changed);
 839 int br_vlan_delete(struct net_bridge *br, u16 vid);
 840 void br_vlan_flush(struct net_bridge *br);
 841 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 842 void br_recalculate_fwd_mask(struct net_bridge *br);
 843 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 844 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 845 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 846 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 847 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 848 int br_vlan_init(struct net_bridge *br);
 849 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 850 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 851 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 852                  bool *changed);
 853 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 854 void nbp_vlan_flush(struct net_bridge_port *port);
 855 int nbp_vlan_init(struct net_bridge_port *port);
 856 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 857 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 858                        struct br_vlan_stats *stats);
 859
 860 static inline struct net_bridge_vlan_group *br_vlan_group(
 861                                         const struct net_bridge *br)
 862 {
 863         return rtnl_dereference(br->vlgrp);
 864 }
 865
 866 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 867                                         const struct net_bridge_port *p)
 868 {
 869         return rtnl_dereference(p->vlgrp);
 870 }
 871
 872 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 873                                         const struct net_bridge *br)
 874 {
 875         return rcu_dereference(br->vlgrp);
 876 }
 877
 878 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 879                                         const struct net_bridge_port *p)
 880 {
 881         return rcu_dereference(p->vlgrp);
 882 }
 883
 884 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 885  * skb, the vlan tag will always be present if the frame was tagged.
 886  */
 887 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 888 {
 889         int err = 0;
 890
 891         if (skb_vlan_tag_present(skb)) {
 892                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 893         } else {
 894                 *vid = 0;
 895                 err = -EINVAL;
 896         }
 897
 898         return err;
 899 }
 900
 901 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 902 {
 903         if (!vg)
 904                 return 0;
 905
 906         smp_rmb();
 907         return vg->pvid;
 908 }
 909
 910 #else
 911 static inline bool br_allowed_ingress(const struct net_bridge *br,
 912                                       struct net_bridge_vlan_group *vg,
 913                                       struct sk_buff *skb,
 914                                       u16 *vid)
 915 {
 916         return true;
 917 }
 918
 919 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 920                                      const struct sk_buff *skb)
 921 {
 922         return true;
 923 }
 924
 925 static inline bool br_should_learn(struct net_bridge_port *p,
 926                                    struct sk_buff *skb, u16 *vid)
 927 {
 928         return true;
 929 }
 930
 931 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 932                                              const struct net_bridge_port *port,
 933                                              struct net_bridge_vlan_group *vg,
 934                                              struct sk_buff *skb)
 935 {
 936         return skb;
 937 }
 938
 939 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
 940                               bool *changed)
 941 {
 942         *changed = false;
 943         return -EOPNOTSUPP;
 944 }
 945
 946 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 947 {
 948         return -EOPNOTSUPP;
 949 }
 950
 951 static inline void br_vlan_flush(struct net_bridge *br)
 952 {
 953 }
 954
 955 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 956 {
 957 }
 958
 959 static inline int br_vlan_init(struct net_bridge *br)
 960 {
 961         return 0;
 962 }
 963
 964 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
 965                                bool *changed)
 966 {
 967         *changed = false;
 968         return -EOPNOTSUPP;
 969 }
 970
 971 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 972 {
 973         return -EOPNOTSUPP;
 974 }
 975
 976 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 977 {
 978 }
 979
 980 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 981                                                    u16 vid)
 982 {
 983         return NULL;
 984 }
 985
 986 static inline int nbp_vlan_init(struct net_bridge_port *port)
 987 {
 988         return 0;
 989 }
 990
 991 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 992 {
 993         return 0;
 994 }
 995
 996 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 997 {
 998         return 0;
 999 }
1000
1001 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1002                                           unsigned long val)
1003 {
1004         return -EOPNOTSUPP;
1005 }
1006
1007 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1008                                          u32 filter_mask)
1009 {
1010         return 0;
1011 }
1012
1013 static inline struct net_bridge_vlan_group *br_vlan_group(
1014                                         const struct net_bridge *br)
1015 {
1016         return NULL;
1017 }
1018
1019 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1020                                         const struct net_bridge_port *p)
1021 {
1022         return NULL;
1023 }
1024
1025 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1026                                         const struct net_bridge *br)
1027 {
1028         return NULL;
1029 }
1030
1031 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1032                                         const struct net_bridge_port *p)
1033 {
1034         return NULL;
1035 }
1036
1037 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1038                                      struct br_vlan_stats *stats)
1039 {
1040 }
1041 #endif
1042
1043 struct nf_br_ops {
1044         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1045 };
1046 extern const struct nf_br_ops __rcu *nf_br_ops;
1047
1048 /* br_netfilter.c */
1049 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1050 int br_nf_core_init(void);
1051 void br_nf_core_fini(void);
1052 void br_netfilter_rtable_init(struct net_bridge *);
1053 #else
1054 static inline int br_nf_core_init(void) { return 0; }
1055 static inline void br_nf_core_fini(void) {}
1056 #define br_netfilter_rtable_init(x)
1057 #endif
1058
1059 /* br_stp.c */
1060 void br_set_state(struct net_bridge_port *p, unsigned int state);
1061 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1062 void br_init_port(struct net_bridge_port *p);
1063 void br_become_designated_port(struct net_bridge_port *p);
1064
1065 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1066 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1067 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1068 int br_set_max_age(struct net_bridge *br, unsigned long x);
1069 int __set_ageing_time(struct net_device *dev, unsigned long t);
1070 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1071
1072
1073 /* br_stp_if.c */
1074 void br_stp_enable_bridge(struct net_bridge *br);
1075 void br_stp_disable_bridge(struct net_bridge *br);
1076 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1077 void br_stp_enable_port(struct net_bridge_port *p);
1078 void br_stp_disable_port(struct net_bridge_port *p);
1079 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1080 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1081 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1082 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1083 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1084 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1085
1086 /* br_stp_bpdu.c */
1087 struct stp_proto;
1088 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1089                 struct net_device *dev);
1090
1091 /* br_stp_timer.c */
1092 void br_stp_timer_init(struct net_bridge *br);
1093 void br_stp_port_timer_init(struct net_bridge_port *p);
1094 unsigned long br_timer_value(const struct timer_list *timer);
1095
1096 /* br.c */
1097 #if IS_ENABLED(CONFIG_ATM_LANE)
1098 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1099 #endif
1100
1101 /* br_netlink.c */
1102 extern struct rtnl_link_ops br_link_ops;
1103 int br_netlink_init(void);
1104 void br_netlink_fini(void);
1105 void br_ifinfo_notify(int event, const struct net_bridge *br,
1106                       const struct net_bridge_port *port);
1107 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1108 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1109 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1110                u32 filter_mask, int nlflags);
1111
1112 #ifdef CONFIG_SYSFS
1113 /* br_sysfs_if.c */
1114 extern const struct sysfs_ops brport_sysfs_ops;
1115 int br_sysfs_addif(struct net_bridge_port *p);
1116 int br_sysfs_renameif(struct net_bridge_port *p);
1117
1118 /* br_sysfs_br.c */
1119 int br_sysfs_addbr(struct net_device *dev);
1120 void br_sysfs_delbr(struct net_device *dev);
1121
1122 #else
1123
1124 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1125 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1126 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1127 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1128 #endif /* CONFIG_SYSFS */
1129
1130 /* br_switchdev.c */
1131 #ifdef CONFIG_NET_SWITCHDEV
1132 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1133 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1134                               struct sk_buff *skb);
1135 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1136                                   const struct sk_buff *skb);
1137 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1138                                unsigned long flags,
1139                                unsigned long mask);
1140 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1141                              int type);
1142 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags);
1143 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1144
1145 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1146 {
1147         skb->offload_fwd_mark = 0;
1148 }
1149 #else
1150 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1151 {
1152         return 0;
1153 }
1154
1155 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1156                                             struct sk_buff *skb)
1157 {
1158 }
1159
1160 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1161                                                 const struct sk_buff *skb)
1162 {
1163         return true;
1164 }
1165
1166 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1167                                              unsigned long flags,
1168                                              unsigned long mask)
1169 {
1170         return 0;
1171 }
1172
1173 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1174                                              u16 vid, u16 flags)
1175 {
1176         return -EOPNOTSUPP;
1177 }
1178
1179 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1180 {
1181         return -EOPNOTSUPP;
1182 }
1183
1184 static inline void
1185 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1186 {
1187 }
1188
1189 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1190 {
1191 }
1192 #endif /* CONFIG_NET_SWITCHDEV */
1193
1194 /* br_arp_nd_proxy.c */
1195 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1196 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1197                               u16 vid, struct net_bridge_port *p);
1198 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1199                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1200 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1201 #endif