net/bridge/br_private.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <linux/netpoll.h>
  19 #include <linux/u64_stats_sync.h>
  20 #include <net/route.h>
  21 #include <net/ip6_fib.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/rhashtable.h>
  24
  25 #define BR_HASH_BITS 8
  26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  27
  28 #define BR_HOLD_TIME (1*HZ)
  29
  30 #define BR_PORT_BITS    10
  31 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  32
  33 #define BR_VERSION      "2.3"
  34
  35 /* Control of forwarding link local multicast */
  36 #define BR_GROUPFWD_DEFAULT     0
  37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  38 #define BR_GROUPFWD_RESTRICTED  0x0007u
  39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  40 #define BR_GROUPFWD_8021AD      0xB801u
  41
  42 /* Path to usermode spanning tree program */
  43 #define BR_STP_PROG     "/sbin/bridge-stp"
  44
  45 typedef struct bridge_id bridge_id;
  46 typedef struct mac_addr mac_addr;
  47 typedef __u16 port_id;
  48
  49 struct bridge_id
  50 {
  51         unsigned char   prio[2];
  52         unsigned char   addr[ETH_ALEN];
  53 };
  54
  55 struct mac_addr
  56 {
  57         unsigned char   addr[ETH_ALEN];
  58 };
  59
  60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  61 /* our own querier */
  62 struct bridge_mcast_own_query {
  63         struct timer_list       timer;
  64         u32                     startup_sent;
  65 };
  66
  67 /* other querier */
  68 struct bridge_mcast_other_query {
  69         struct timer_list               timer;
  70         unsigned long                   delay_time;
  71 };
  72
  73 /* selected querier */
  74 struct bridge_mcast_querier {
  75         struct br_ip addr;
  76         struct net_bridge_port __rcu    *port;
  77 };
  78
  79 /* IGMP/MLD statistics */
  80 struct bridge_mcast_stats {
  81         struct br_mcast_stats mstats;
  82         struct u64_stats_sync syncp;
  83 };
  84 #endif
  85
  86 struct br_vlan_stats {
  87         u64 rx_bytes;
  88         u64 rx_packets;
  89         u64 tx_bytes;
  90         u64 tx_packets;
  91         struct u64_stats_sync syncp;
  92 };
  93
  94 /**
  95  * struct net_bridge_vlan - per-vlan entry
  96  *
  97  * @vnode: rhashtable member
  98  * @vid: VLAN id
  99  * @flags: bridge vlan flags
 100  * @stats: per-cpu VLAN statistics
 101  * @br: if MASTER flag set, this points to a bridge struct
 102  * @port: if MASTER flag unset, this points to a port struct
 103  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 104  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 105  *          for this VLAN entry
 106  * @vlist: sorted list of VLAN entries
 107  * @rcu: used for entry destruction
 108  *
 109  * This structure is shared between the global per-VLAN entries contained in
 110  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 111  * the port's rhashtable. The union entries should be interpreted depending on
 112  * the entry flags that are set.
 113  */
 114 struct net_bridge_vlan {
 115         struct rhash_head               vnode;
 116         u16                             vid;
 117         u16                             flags;
 118         struct br_vlan_stats __percpu   *stats;
 119         union {
 120                 struct net_bridge       *br;
 121                 struct net_bridge_port  *port;
 122         };
 123         union {
 124                 atomic_t                refcnt;
 125                 struct net_bridge_vlan  *brvlan;
 126         };
 127         struct list_head                vlist;
 128
 129         struct rcu_head                 rcu;
 130 };
 131
 132 /**
 133  * struct net_bridge_vlan_group
 134  *
 135  * @vlan_hash: VLAN entry rhashtable
 136  * @vlan_list: sorted VLAN entry list
 137  * @num_vlans: number of total VLAN entries
 138  * @pvid: PVID VLAN id
 139  *
 140  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 141  *            primitives because the bridge can have entries in its list which
 142  *            are just for global context but not for filtering, i.e. they have
 143  *            the master flag set but not the brentry flag. If you have to check
 144  *            if there're "real" entries in the bridge please test @num_vlans
 145  */
 146 struct net_bridge_vlan_group {
 147         struct rhashtable               vlan_hash;
 148         struct list_head                vlan_list;
 149         u16                             num_vlans;
 150         u16                             pvid;
 151 };
 152
 153 struct net_bridge_fdb_entry
 154 {
 155         struct hlist_node               hlist;
 156         struct net_bridge_port          *dst;
 157
 158         unsigned long                   updated;
 159         unsigned long                   used;
 160         mac_addr                        addr;
 161         __u16                           vlan_id;
 162         unsigned char                   is_local:1,
 163                                         is_static:1,
 164                                         added_by_user:1,
 165                                         added_by_external_learn:1;
 166         struct rcu_head                 rcu;
 167 };
 168
 169 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 170 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 171
 172 struct net_bridge_port_group {
 173         struct net_bridge_port          *port;
 174         struct net_bridge_port_group __rcu *next;
 175         struct hlist_node               mglist;
 176         struct rcu_head                 rcu;
 177         struct timer_list               timer;
 178         struct br_ip                    addr;
 179         unsigned char                   flags;
 180 };
 181
 182 struct net_bridge_mdb_entry
 183 {
 184         struct hlist_node               hlist[2];
 185         struct net_bridge               *br;
 186         struct net_bridge_port_group __rcu *ports;
 187         struct rcu_head                 rcu;
 188         struct timer_list               timer;
 189         struct br_ip                    addr;
 190         bool                            mglist;
 191 };
 192
 193 struct net_bridge_mdb_htable
 194 {
 195         struct hlist_head               *mhash;
 196         struct rcu_head                 rcu;
 197         struct net_bridge_mdb_htable    *old;
 198         u32                             size;
 199         u32                             max;
 200         u32                             secret;
 201         u32                             ver;
 202 };
 203
 204 struct net_bridge_port
 205 {
 206         struct net_bridge               *br;
 207         struct net_device               *dev;
 208         struct list_head                list;
 209
 210         /* STP */
 211         u8                              priority;
 212         u8                              state;
 213         u16                             port_no;
 214         unsigned char                   topology_change_ack;
 215         unsigned char                   config_pending;
 216         port_id                         port_id;
 217         port_id                         designated_port;
 218         bridge_id                       designated_root;
 219         bridge_id                       designated_bridge;
 220         u32                             path_cost;
 221         u32                             designated_cost;
 222         unsigned long                   designated_age;
 223
 224         struct timer_list               forward_delay_timer;
 225         struct timer_list               hold_timer;
 226         struct timer_list               message_age_timer;
 227         struct kobject                  kobj;
 228         struct rcu_head                 rcu;
 229
 230         unsigned long                   flags;
 231
 232 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 233         struct bridge_mcast_own_query   ip4_own_query;
 234 #if IS_ENABLED(CONFIG_IPV6)
 235         struct bridge_mcast_own_query   ip6_own_query;
 236 #endif /* IS_ENABLED(CONFIG_IPV6) */
 237         unsigned char                   multicast_router;
 238         struct bridge_mcast_stats       __percpu *mcast_stats;
 239         struct timer_list               multicast_router_timer;
 240         struct hlist_head               mglist;
 241         struct hlist_node               rlist;
 242 #endif
 243
 244 #ifdef CONFIG_SYSFS
 245         char                            sysfs_name[IFNAMSIZ];
 246 #endif
 247
 248 #ifdef CONFIG_NET_POLL_CONTROLLER
 249         struct netpoll                  *np;
 250 #endif
 251 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 252         struct net_bridge_vlan_group    __rcu *vlgrp;
 253 #endif
 254 #ifdef CONFIG_NET_SWITCHDEV
 255         int                             offload_fwd_mark;
 256 #endif
 257 };
 258
 259 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 260 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 261
 262 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 263
 264 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 265 {
 266         return rcu_dereference(dev->rx_handler_data);
 267 }
 268
 269 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 270 {
 271         return br_port_exists(dev) ?
 272                 rtnl_dereference(dev->rx_handler_data) : NULL;
 273 }
 274
 275 struct net_bridge
 276 {
 277         spinlock_t                      lock;
 278         struct list_head                port_list;
 279         struct net_device               *dev;
 280
 281         struct pcpu_sw_netstats         __percpu *stats;
 282         spinlock_t                      hash_lock;
 283         struct hlist_head               hash[BR_HASH_SIZE];
 284 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 285         union {
 286                 struct rtable           fake_rtable;
 287                 struct rt6_info         fake_rt6_info;
 288         };
 289         bool                            nf_call_iptables;
 290         bool                            nf_call_ip6tables;
 291         bool                            nf_call_arptables;
 292 #endif
 293         u16                             group_fwd_mask;
 294         u16                             group_fwd_mask_required;
 295
 296         /* STP */
 297         bridge_id                       designated_root;
 298         bridge_id                       bridge_id;
 299         u32                             root_path_cost;
 300         unsigned long                   max_age;
 301         unsigned long                   hello_time;
 302         unsigned long                   forward_delay;
 303         unsigned long                   ageing_time;
 304         unsigned long                   bridge_max_age;
 305         unsigned long                   bridge_hello_time;
 306         unsigned long                   bridge_forward_delay;
 307         unsigned long                   bridge_ageing_time;
 308
 309         u8                              group_addr[ETH_ALEN];
 310         bool                            group_addr_set;
 311         u16                             root_port;
 312
 313         enum {
 314                 BR_NO_STP,              /* no spanning tree */
 315                 BR_KERNEL_STP,          /* old STP in kernel */
 316                 BR_USER_STP,            /* new RSTP in userspace */
 317         } stp_enabled;
 318
 319         unsigned char                   topology_change;
 320         unsigned char                   topology_change_detected;
 321
 322 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 323         unsigned char                   multicast_router;
 324
 325         u8                              multicast_disabled:1;
 326         u8                              multicast_querier:1;
 327         u8                              multicast_query_use_ifaddr:1;
 328         u8                              has_ipv6_addr:1;
 329         u8                              multicast_stats_enabled:1;
 330
 331         u32                             hash_elasticity;
 332         u32                             hash_max;
 333
 334         u32                             multicast_last_member_count;
 335         u32                             multicast_startup_query_count;
 336
 337         u8                              multicast_igmp_version;
 338
 339         unsigned long                   multicast_last_member_interval;
 340         unsigned long                   multicast_membership_interval;
 341         unsigned long                   multicast_querier_interval;
 342         unsigned long                   multicast_query_interval;
 343         unsigned long                   multicast_query_response_interval;
 344         unsigned long                   multicast_startup_query_interval;
 345
 346         spinlock_t                      multicast_lock;
 347         struct net_bridge_mdb_htable __rcu *mdb;
 348         struct hlist_head               router_list;
 349
 350         struct timer_list               multicast_router_timer;
 351         struct bridge_mcast_other_query ip4_other_query;
 352         struct bridge_mcast_own_query   ip4_own_query;
 353         struct bridge_mcast_querier     ip4_querier;
 354         struct bridge_mcast_stats       __percpu *mcast_stats;
 355 #if IS_ENABLED(CONFIG_IPV6)
 356         struct bridge_mcast_other_query ip6_other_query;
 357         struct bridge_mcast_own_query   ip6_own_query;
 358         struct bridge_mcast_querier     ip6_querier;
 359         u8                              multicast_mld_version;
 360 #endif /* IS_ENABLED(CONFIG_IPV6) */
 361 #endif
 362
 363         struct timer_list               hello_timer;
 364         struct timer_list               tcn_timer;
 365         struct timer_list               topology_change_timer;
 366         struct timer_list               gc_timer;
 367         struct kobject                  *ifobj;
 368         u32                             auto_cnt;
 369
 370 #ifdef CONFIG_NET_SWITCHDEV
 371         int offload_fwd_mark;
 372 #endif
 373
 374 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 375         struct net_bridge_vlan_group    __rcu *vlgrp;
 376         u8                              vlan_enabled;
 377         u8                              vlan_stats_enabled;
 378         __be16                          vlan_proto;
 379         u16                             default_pvid;
 380 #endif
 381 };
 382
 383 struct br_input_skb_cb {
 384         struct net_device *brdev;
 385
 386 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 387         int igmp;
 388         int mrouters_only;
 389 #endif
 390
 391         bool proxyarp_replied;
 392
 393 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 394         bool vlan_filtered;
 395 #endif
 396
 397 #ifdef CONFIG_NET_SWITCHDEV
 398         int offload_fwd_mark;
 399 #endif
 400 };
 401
 402 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 403
 404 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 405 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 406 #else
 407 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 408 #endif
 409
 410 #define br_printk(level, br, format, args...)   \
 411         printk(level "%s: " format, (br)->dev->name, ##args)
 412
 413 #define br_err(__br, format, args...)                   \
 414         br_printk(KERN_ERR, __br, format, ##args)
 415 #define br_warn(__br, format, args...)                  \
 416         br_printk(KERN_WARNING, __br, format, ##args)
 417 #define br_notice(__br, format, args...)                \
 418         br_printk(KERN_NOTICE, __br, format, ##args)
 419 #define br_info(__br, format, args...)                  \
 420         br_printk(KERN_INFO, __br, format, ##args)
 421
 422 #define br_debug(br, format, args...)                   \
 423         pr_debug("%s: " format,  (br)->dev->name, ##args)
 424
 425 /* called under bridge lock */
 426 static inline int br_is_root_bridge(const struct net_bridge *br)
 427 {
 428         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 429 }
 430
 431 /* check if a VLAN entry is global */
 432 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 433 {
 434         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 435 }
 436
 437 /* check if a VLAN entry is used by the bridge */
 438 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 439 {
 440         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 441 }
 442
 443 /* check if we should use the vlan entry, returns false if it's only context */
 444 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 445 {
 446         if (br_vlan_is_master(v)) {
 447                 if (br_vlan_is_brentry(v))
 448                         return true;
 449                 else
 450                         return false;
 451         }
 452
 453         return true;
 454 }
 455
 456 /* br_device.c */
 457 void br_dev_setup(struct net_device *dev);
 458 void br_dev_delete(struct net_device *dev, struct list_head *list);
 459 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 460 #ifdef CONFIG_NET_POLL_CONTROLLER
 461 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 462                                        struct sk_buff *skb)
 463 {
 464         struct netpoll *np = p->np;
 465
 466         if (np)
 467                 netpoll_send_skb(np, skb);
 468 }
 469
 470 int br_netpoll_enable(struct net_bridge_port *p);
 471 void br_netpoll_disable(struct net_bridge_port *p);
 472 #else
 473 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 474                                        struct sk_buff *skb)
 475 {
 476 }
 477
 478 static inline int br_netpoll_enable(struct net_bridge_port *p)
 479 {
 480         return 0;
 481 }
 482
 483 static inline void br_netpoll_disable(struct net_bridge_port *p)
 484 {
 485 }
 486 #endif
 487
 488 /* br_fdb.c */
 489 int br_fdb_init(void);
 490 void br_fdb_fini(void);
 491 void br_fdb_flush(struct net_bridge *br);
 492 void br_fdb_find_delete_local(struct net_bridge *br,
 493                               const struct net_bridge_port *p,
 494                               const unsigned char *addr, u16 vid);
 495 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 496 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 497 void br_fdb_cleanup(unsigned long arg);
 498 void br_fdb_delete_by_port(struct net_bridge *br,
 499                            const struct net_bridge_port *p, u16 vid, int do_all);
 500 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 501                                           const unsigned char *addr, __u16 vid);
 502 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 503 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 504                    unsigned long off);
 505 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 506                   const unsigned char *addr, u16 vid);
 507 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 508                    const unsigned char *addr, u16 vid, bool added_by_user);
 509
 510 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 511                   struct net_device *dev, const unsigned char *addr, u16 vid);
 512 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 513                const unsigned char *addr, u16 vid, u16 nlh_flags);
 514 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 515                 struct net_device *dev, struct net_device *fdev, int *idx);
 516 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 517 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 518 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 519                               const unsigned char *addr, u16 vid);
 520 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 521                               const unsigned char *addr, u16 vid);
 522
 523 /* br_forward.c */
 524 enum br_pkt_type {
 525         BR_PKT_UNICAST,
 526         BR_PKT_MULTICAST,
 527         BR_PKT_BROADCAST
 528 };
 529 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 530 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 531                 bool local_rcv, bool local_orig);
 532 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 533 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 534               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 535
 536 /* br_if.c */
 537 void br_port_carrier_check(struct net_bridge_port *p);
 538 int br_add_bridge(struct net *net, const char *name);
 539 int br_del_bridge(struct net *net, const char *name);
 540 int br_add_if(struct net_bridge *br, struct net_device *dev);
 541 int br_del_if(struct net_bridge *br, struct net_device *dev);
 542 int br_min_mtu(const struct net_bridge *br);
 543 netdev_features_t br_features_recompute(struct net_bridge *br,
 544                                         netdev_features_t features);
 545 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 546 void br_manage_promisc(struct net_bridge *br);
 547
 548 /* br_input.c */
 549 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 550 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 551
 552 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 553 {
 554         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 555 }
 556
 557 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 558 {
 559         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 560 }
 561
 562 /* br_ioctl.c */
 563 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 564 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 565                              void __user *arg);
 566
 567 /* br_multicast.c */
 568 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 569 extern unsigned int br_mdb_rehash_seq;
 570 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 571                      struct sk_buff *skb, u16 vid);
 572 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 573                                         struct sk_buff *skb, u16 vid);
 574 int br_multicast_add_port(struct net_bridge_port *port);
 575 void br_multicast_del_port(struct net_bridge_port *port);
 576 void br_multicast_enable_port(struct net_bridge_port *port);
 577 void br_multicast_disable_port(struct net_bridge_port *port);
 578 void br_multicast_init(struct net_bridge *br);
 579 void br_multicast_open(struct net_bridge *br);
 580 void br_multicast_stop(struct net_bridge *br);
 581 void br_multicast_dev_del(struct net_bridge *br);
 582 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 583                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 584 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 585 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 586 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 587 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 588 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 589 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 590 #if IS_ENABLED(CONFIG_IPV6)
 591 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 592 #endif
 593 struct net_bridge_mdb_entry *
 594 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 595 struct net_bridge_mdb_entry *
 596 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 597                        struct br_ip *group);
 598 void br_multicast_free_pg(struct rcu_head *head);
 599 struct net_bridge_port_group *
 600 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 601                             struct net_bridge_port_group __rcu *next,
 602                             unsigned char flags);
 603 void br_mdb_init(void);
 604 void br_mdb_uninit(void);
 605 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 606                    struct br_ip *group, int type, u8 flags);
 607 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 608                    int type);
 609 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 610                         const struct sk_buff *skb, u8 type, u8 dir);
 611 int br_multicast_init_stats(struct net_bridge *br);
 612 void br_multicast_get_stats(const struct net_bridge *br,
 613                             const struct net_bridge_port *p,
 614                             struct br_mcast_stats *dest);
 615
 616 #define mlock_dereference(X, br) \
 617         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 618
 619 static inline bool br_multicast_is_router(struct net_bridge *br)
 620 {
 621         return br->multicast_router == 2 ||
 622                (br->multicast_router == 1 &&
 623                 timer_pending(&br->multicast_router_timer));
 624 }
 625
 626 static inline bool
 627 __br_multicast_querier_exists(struct net_bridge *br,
 628                                 struct bridge_mcast_other_query *querier,
 629                                 const bool is_ipv6)
 630 {
 631         bool own_querier_enabled;
 632
 633         if (br->multicast_querier) {
 634                 if (is_ipv6 && !br->has_ipv6_addr)
 635                         own_querier_enabled = false;
 636                 else
 637                         own_querier_enabled = true;
 638         } else {
 639                 own_querier_enabled = false;
 640         }
 641
 642         return time_is_before_jiffies(querier->delay_time) &&
 643                (own_querier_enabled || timer_pending(&querier->timer));
 644 }
 645
 646 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 647                                                struct ethhdr *eth)
 648 {
 649         switch (eth->h_proto) {
 650         case (htons(ETH_P_IP)):
 651                 return __br_multicast_querier_exists(br,
 652                         &br->ip4_other_query, false);
 653 #if IS_ENABLED(CONFIG_IPV6)
 654         case (htons(ETH_P_IPV6)):
 655                 return __br_multicast_querier_exists(br,
 656                         &br->ip6_other_query, true);
 657 #endif
 658         default:
 659                 return false;
 660         }
 661 }
 662
 663 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 664 {
 665         return BR_INPUT_SKB_CB(skb)->igmp;
 666 }
 667 #else
 668 static inline int br_multicast_rcv(struct net_bridge *br,
 669                                    struct net_bridge_port *port,
 670                                    struct sk_buff *skb,
 671                                    u16 vid)
 672 {
 673         return 0;
 674 }
 675
 676 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 677                                                       struct sk_buff *skb, u16 vid)
 678 {
 679         return NULL;
 680 }
 681
 682 static inline int br_multicast_add_port(struct net_bridge_port *port)
 683 {
 684         return 0;
 685 }
 686
 687 static inline void br_multicast_del_port(struct net_bridge_port *port)
 688 {
 689 }
 690
 691 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 692 {
 693 }
 694
 695 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 696 {
 697 }
 698
 699 static inline void br_multicast_init(struct net_bridge *br)
 700 {
 701 }
 702
 703 static inline void br_multicast_open(struct net_bridge *br)
 704 {
 705 }
 706
 707 static inline void br_multicast_stop(struct net_bridge *br)
 708 {
 709 }
 710
 711 static inline void br_multicast_dev_del(struct net_bridge *br)
 712 {
 713 }
 714
 715 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 716                                       struct sk_buff *skb,
 717                                       bool local_rcv, bool local_orig)
 718 {
 719 }
 720
 721 static inline bool br_multicast_is_router(struct net_bridge *br)
 722 {
 723         return 0;
 724 }
 725
 726 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 727                                                struct ethhdr *eth)
 728 {
 729         return false;
 730 }
 731
 732 static inline void br_mdb_init(void)
 733 {
 734 }
 735
 736 static inline void br_mdb_uninit(void)
 737 {
 738 }
 739
 740 static inline void br_multicast_count(struct net_bridge *br,
 741                                       const struct net_bridge_port *p,
 742                                       const struct sk_buff *skb,
 743                                       u8 type, u8 dir)
 744 {
 745 }
 746
 747 static inline int br_multicast_init_stats(struct net_bridge *br)
 748 {
 749         return 0;
 750 }
 751
 752 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 753 {
 754         return 0;
 755 }
 756 #endif
 757
 758 /* br_vlan.c */
 759 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 760 bool br_allowed_ingress(const struct net_bridge *br,
 761                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 762                         u16 *vid);
 763 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 764                        const struct sk_buff *skb);
 765 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 766 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 767                                struct net_bridge_vlan_group *vg,
 768                                struct sk_buff *skb);
 769 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 770 int br_vlan_delete(struct net_bridge *br, u16 vid);
 771 void br_vlan_flush(struct net_bridge *br);
 772 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 773 void br_recalculate_fwd_mask(struct net_bridge *br);
 774 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 775 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 776 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 777 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 778 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 779 int br_vlan_init(struct net_bridge *br);
 780 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 781 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 782 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 783 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 784 void nbp_vlan_flush(struct net_bridge_port *port);
 785 int nbp_vlan_init(struct net_bridge_port *port);
 786 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 787 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 788                        struct br_vlan_stats *stats);
 789
 790 static inline struct net_bridge_vlan_group *br_vlan_group(
 791                                         const struct net_bridge *br)
 792 {
 793         return rtnl_dereference(br->vlgrp);
 794 }
 795
 796 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 797                                         const struct net_bridge_port *p)
 798 {
 799         return rtnl_dereference(p->vlgrp);
 800 }
 801
 802 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 803                                         const struct net_bridge *br)
 804 {
 805         return rcu_dereference(br->vlgrp);
 806 }
 807
 808 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 809                                         const struct net_bridge_port *p)
 810 {
 811         return rcu_dereference(p->vlgrp);
 812 }
 813
 814 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 815  * skb, the vlan tag will always be present if the frame was tagged.
 816  */
 817 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 818 {
 819         int err = 0;
 820
 821         if (skb_vlan_tag_present(skb)) {
 822                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 823         } else {
 824                 *vid = 0;
 825                 err = -EINVAL;
 826         }
 827
 828         return err;
 829 }
 830
 831 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 832 {
 833         if (!vg)
 834                 return 0;
 835
 836         smp_rmb();
 837         return vg->pvid;
 838 }
 839
 840 static inline int br_vlan_enabled(struct net_bridge *br)
 841 {
 842         return br->vlan_enabled;
 843 }
 844 #else
 845 static inline bool br_allowed_ingress(const struct net_bridge *br,
 846                                       struct net_bridge_vlan_group *vg,
 847                                       struct sk_buff *skb,
 848                                       u16 *vid)
 849 {
 850         return true;
 851 }
 852
 853 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 854                                      const struct sk_buff *skb)
 855 {
 856         return true;
 857 }
 858
 859 static inline bool br_should_learn(struct net_bridge_port *p,
 860                                    struct sk_buff *skb, u16 *vid)
 861 {
 862         return true;
 863 }
 864
 865 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 866                                              struct net_bridge_vlan_group *vg,
 867                                              struct sk_buff *skb)
 868 {
 869         return skb;
 870 }
 871
 872 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 873 {
 874         return -EOPNOTSUPP;
 875 }
 876
 877 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 878 {
 879         return -EOPNOTSUPP;
 880 }
 881
 882 static inline void br_vlan_flush(struct net_bridge *br)
 883 {
 884 }
 885
 886 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 887 {
 888 }
 889
 890 static inline int br_vlan_init(struct net_bridge *br)
 891 {
 892         return 0;
 893 }
 894
 895 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 896 {
 897         return -EOPNOTSUPP;
 898 }
 899
 900 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 901 {
 902         return -EOPNOTSUPP;
 903 }
 904
 905 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 906 {
 907 }
 908
 909 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 910                                                    u16 vid)
 911 {
 912         return NULL;
 913 }
 914
 915 static inline int nbp_vlan_init(struct net_bridge_port *port)
 916 {
 917         return 0;
 918 }
 919
 920 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 921 {
 922         return 0;
 923 }
 924
 925 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 926 {
 927         return 0;
 928 }
 929
 930 static inline int br_vlan_enabled(struct net_bridge *br)
 931 {
 932         return 0;
 933 }
 934
 935 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 936                                           unsigned long val)
 937 {
 938         return -EOPNOTSUPP;
 939 }
 940
 941 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 942                                          u32 filter_mask)
 943 {
 944         return 0;
 945 }
 946
 947 static inline struct net_bridge_vlan_group *br_vlan_group(
 948                                         const struct net_bridge *br)
 949 {
 950         return NULL;
 951 }
 952
 953 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 954                                         const struct net_bridge_port *p)
 955 {
 956         return NULL;
 957 }
 958
 959 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 960                                         const struct net_bridge *br)
 961 {
 962         return NULL;
 963 }
 964
 965 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 966                                         const struct net_bridge_port *p)
 967 {
 968         return NULL;
 969 }
 970
 971 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 972                                      struct br_vlan_stats *stats)
 973 {
 974 }
 975 #endif
 976
 977 struct nf_br_ops {
 978         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 979 };
 980 extern const struct nf_br_ops __rcu *nf_br_ops;
 981
 982 /* br_netfilter.c */
 983 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 984 int br_nf_core_init(void);
 985 void br_nf_core_fini(void);
 986 void br_netfilter_rtable_init(struct net_bridge *);
 987 #else
 988 static inline int br_nf_core_init(void) { return 0; }
 989 static inline void br_nf_core_fini(void) {}
 990 #define br_netfilter_rtable_init(x)
 991 #endif
 992
 993 /* br_stp.c */
 994 void br_set_state(struct net_bridge_port *p, unsigned int state);
 995 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
 996 void br_init_port(struct net_bridge_port *p);
 997 void br_become_designated_port(struct net_bridge_port *p);
 998
 999 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1000 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1001 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1002 int br_set_max_age(struct net_bridge *br, unsigned long x);
1003 int __set_ageing_time(struct net_device *dev, unsigned long t);
1004 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1005
1006
1007 /* br_stp_if.c */
1008 void br_stp_enable_bridge(struct net_bridge *br);
1009 void br_stp_disable_bridge(struct net_bridge *br);
1010 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1011 void br_stp_enable_port(struct net_bridge_port *p);
1012 void br_stp_disable_port(struct net_bridge_port *p);
1013 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1014 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1015 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1016 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1017 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1018 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1019
1020 /* br_stp_bpdu.c */
1021 struct stp_proto;
1022 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1023                 struct net_device *dev);
1024
1025 /* br_stp_timer.c */
1026 void br_stp_timer_init(struct net_bridge *br);
1027 void br_stp_port_timer_init(struct net_bridge_port *p);
1028 unsigned long br_timer_value(const struct timer_list *timer);
1029
1030 /* br.c */
1031 #if IS_ENABLED(CONFIG_ATM_LANE)
1032 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1033 #endif
1034
1035 /* br_netlink.c */
1036 extern struct rtnl_link_ops br_link_ops;
1037 int br_netlink_init(void);
1038 void br_netlink_fini(void);
1039 void br_ifinfo_notify(int event, struct net_bridge_port *port);
1040 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1041 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1042 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1043                u32 filter_mask, int nlflags);
1044
1045 #ifdef CONFIG_SYSFS
1046 /* br_sysfs_if.c */
1047 extern const struct sysfs_ops brport_sysfs_ops;
1048 int br_sysfs_addif(struct net_bridge_port *p);
1049 int br_sysfs_renameif(struct net_bridge_port *p);
1050
1051 /* br_sysfs_br.c */
1052 int br_sysfs_addbr(struct net_device *dev);
1053 void br_sysfs_delbr(struct net_device *dev);
1054
1055 #else
1056
1057 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1058 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1059 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1060 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1061 #endif /* CONFIG_SYSFS */
1062
1063 /* br_switchdev.c */
1064 #ifdef CONFIG_NET_SWITCHDEV
1065 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1066 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1067                               struct sk_buff *skb);
1068 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1069                                   const struct sk_buff *skb);
1070 #else
1071 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1072 {
1073         return 0;
1074 }
1075
1076 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1077                                             struct sk_buff *skb)
1078 {
1079 }
1080
1081 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1082                                                 const struct sk_buff *skb)
1083 {
1084         return true;
1085 }
1086 #endif /* CONFIG_NET_SWITCHDEV */
1087
1088 #endif