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
  22 #define BR_HASH_BITS 8
  23 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  24
  25 #define BR_HOLD_TIME (1*HZ)
  26
  27 #define BR_PORT_BITS    10
  28 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  29
  30 #define BR_VERSION      "2.3"
  31
  32 /* Control of forwarding link local multicast */
  33 #define BR_GROUPFWD_DEFAULT     0
  34 /* Don't allow forwarding control protocols like STP and LLDP */
  35 #define BR_GROUPFWD_RESTRICTED  0x4007u
  36
  37 /* Path to usermode spanning tree program */
  38 #define BR_STP_PROG     "/sbin/bridge-stp"
  39
  40 typedef struct bridge_id bridge_id;
  41 typedef struct mac_addr mac_addr;
  42 typedef __u16 port_id;
  43
  44 struct bridge_id
  45 {
  46         unsigned char   prio[2];
  47         unsigned char   addr[6];
  48 };
  49
  50 struct mac_addr
  51 {
  52         unsigned char   addr[6];
  53 };
  54
  55 struct br_ip
  56 {
  57         union {
  58                 __be32  ip4;
  59 #if IS_ENABLED(CONFIG_IPV6)
  60                 struct in6_addr ip6;
  61 #endif
  62         } u;
  63         __be16          proto;
  64 };
  65
  66 struct net_bridge_fdb_entry
  67 {
  68         struct hlist_node               hlist;
  69         struct net_bridge_port          *dst;
  70
  71         struct rcu_head                 rcu;
  72         unsigned long                   updated;
  73         unsigned long                   used;
  74         mac_addr                        addr;
  75         unsigned char                   is_local;
  76         unsigned char                   is_static;
  77 };
  78
  79 struct net_bridge_port_group {
  80         struct net_bridge_port          *port;
  81         struct net_bridge_port_group __rcu *next;
  82         struct hlist_node               mglist;
  83         struct rcu_head                 rcu;
  84         struct timer_list               timer;
  85         struct br_ip                    addr;
  86         unsigned char                   state;
  87 };
  88
  89 struct net_bridge_mdb_entry
  90 {
  91         struct hlist_node               hlist[2];
  92         struct net_bridge               *br;
  93         struct net_bridge_port_group __rcu *ports;
  94         struct rcu_head                 rcu;
  95         struct timer_list               timer;
  96         struct br_ip                    addr;
  97         bool                            mglist;
  98 };
  99
 100 struct net_bridge_mdb_htable
 101 {
 102         struct hlist_head               *mhash;
 103         struct rcu_head                 rcu;
 104         struct net_bridge_mdb_htable    *old;
 105         u32                             size;
 106         u32                             max;
 107         u32                             secret;
 108         u32                             ver;
 109 };
 110
 111 struct net_bridge_port
 112 {
 113         struct net_bridge               *br;
 114         struct net_device               *dev;
 115         struct list_head                list;
 116
 117         /* STP */
 118         u8                              priority;
 119         u8                              state;
 120         u16                             port_no;
 121         unsigned char                   topology_change_ack;
 122         unsigned char                   config_pending;
 123         port_id                         port_id;
 124         port_id                         designated_port;
 125         bridge_id                       designated_root;
 126         bridge_id                       designated_bridge;
 127         u32                             path_cost;
 128         u32                             designated_cost;
 129         unsigned long                   designated_age;
 130
 131         struct timer_list               forward_delay_timer;
 132         struct timer_list               hold_timer;
 133         struct timer_list               message_age_timer;
 134         struct kobject                  kobj;
 135         struct rcu_head                 rcu;
 136
 137         unsigned long                   flags;
 138 #define BR_HAIRPIN_MODE         0x00000001
 139 #define BR_BPDU_GUARD           0x00000002
 140 #define BR_ROOT_BLOCK           0x00000004
 141 #define BR_MULTICAST_FAST_LEAVE 0x00000008
 142
 143 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 144         u32                             multicast_startup_queries_sent;
 145         unsigned char                   multicast_router;
 146         struct timer_list               multicast_router_timer;
 147         struct timer_list               multicast_query_timer;
 148         struct hlist_head               mglist;
 149         struct hlist_node               rlist;
 150 #endif
 151
 152 #ifdef CONFIG_SYSFS
 153         char                            sysfs_name[IFNAMSIZ];
 154 #endif
 155
 156 #ifdef CONFIG_NET_POLL_CONTROLLER
 157         struct netpoll                  *np;
 158 #endif
 159 };
 160
 161 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 162
 163 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 164 {
 165         struct net_bridge_port *port =
 166                         rcu_dereference_rtnl(dev->rx_handler_data);
 167
 168         return br_port_exists(dev) ? port : NULL;
 169 }
 170
 171 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 172 {
 173         return br_port_exists(dev) ?
 174                 rtnl_dereference(dev->rx_handler_data) : NULL;
 175 }
 176
 177 struct br_cpu_netstats {
 178         u64                     rx_packets;
 179         u64                     rx_bytes;
 180         u64                     tx_packets;
 181         u64                     tx_bytes;
 182         struct u64_stats_sync   syncp;
 183 };
 184
 185 struct net_bridge
 186 {
 187         spinlock_t                      lock;
 188         struct list_head                port_list;
 189         struct net_device               *dev;
 190
 191         struct br_cpu_netstats __percpu *stats;
 192         spinlock_t                      hash_lock;
 193         struct hlist_head               hash[BR_HASH_SIZE];
 194 #ifdef CONFIG_BRIDGE_NETFILTER
 195         struct rtable                   fake_rtable;
 196         bool                            nf_call_iptables;
 197         bool                            nf_call_ip6tables;
 198         bool                            nf_call_arptables;
 199 #endif
 200         unsigned long                   flags;
 201 #define BR_SET_MAC_ADDR         0x00000001
 202
 203         u16                             group_fwd_mask;
 204
 205         /* STP */
 206         bridge_id                       designated_root;
 207         bridge_id                       bridge_id;
 208         u32                             root_path_cost;
 209         unsigned long                   max_age;
 210         unsigned long                   hello_time;
 211         unsigned long                   forward_delay;
 212         unsigned long                   bridge_max_age;
 213         unsigned long                   ageing_time;
 214         unsigned long                   bridge_hello_time;
 215         unsigned long                   bridge_forward_delay;
 216
 217         u8                              group_addr[ETH_ALEN];
 218         u16                             root_port;
 219
 220         enum {
 221                 BR_NO_STP,              /* no spanning tree */
 222                 BR_KERNEL_STP,          /* old STP in kernel */
 223                 BR_USER_STP,            /* new RSTP in userspace */
 224         } stp_enabled;
 225
 226         unsigned char                   topology_change;
 227         unsigned char                   topology_change_detected;
 228
 229 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 230         unsigned char                   multicast_router;
 231
 232         u8                              multicast_disabled:1;
 233         u8                              multicast_querier:1;
 234
 235         u32                             hash_elasticity;
 236         u32                             hash_max;
 237
 238         u32                             multicast_last_member_count;
 239         u32                             multicast_startup_queries_sent;
 240         u32                             multicast_startup_query_count;
 241
 242         unsigned long                   multicast_last_member_interval;
 243         unsigned long                   multicast_membership_interval;
 244         unsigned long                   multicast_querier_interval;
 245         unsigned long                   multicast_query_interval;
 246         unsigned long                   multicast_query_response_interval;
 247         unsigned long                   multicast_startup_query_interval;
 248
 249         spinlock_t                      multicast_lock;
 250         struct net_bridge_mdb_htable __rcu *mdb;
 251         struct hlist_head               router_list;
 252
 253         struct timer_list               multicast_router_timer;
 254         struct timer_list               multicast_querier_timer;
 255         struct timer_list               multicast_query_timer;
 256 #endif
 257
 258         struct timer_list               hello_timer;
 259         struct timer_list               tcn_timer;
 260         struct timer_list               topology_change_timer;
 261         struct timer_list               gc_timer;
 262         struct kobject                  *ifobj;
 263 };
 264
 265 struct br_input_skb_cb {
 266         struct net_device *brdev;
 267 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 268         int igmp;
 269         int mrouters_only;
 270 #endif
 271 };
 272
 273 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 274
 275 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 276 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 277 #else
 278 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 279 #endif
 280
 281 #define br_printk(level, br, format, args...)   \
 282         printk(level "%s: " format, (br)->dev->name, ##args)
 283
 284 #define br_err(__br, format, args...)                   \
 285         br_printk(KERN_ERR, __br, format, ##args)
 286 #define br_warn(__br, format, args...)                  \
 287         br_printk(KERN_WARNING, __br, format, ##args)
 288 #define br_notice(__br, format, args...)                \
 289         br_printk(KERN_NOTICE, __br, format, ##args)
 290 #define br_info(__br, format, args...)                  \
 291         br_printk(KERN_INFO, __br, format, ##args)
 292
 293 #define br_debug(br, format, args...)                   \
 294         pr_debug("%s: " format,  (br)->dev->name, ##args)
 295
 296 extern struct notifier_block br_device_notifier;
 297
 298 /* called under bridge lock */
 299 static inline int br_is_root_bridge(const struct net_bridge *br)
 300 {
 301         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 302 }
 303
 304 /* br_device.c */
 305 extern void br_dev_setup(struct net_device *dev);
 306 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 307 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 308                                struct net_device *dev);
 309 #ifdef CONFIG_NET_POLL_CONTROLLER
 310 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 311 {
 312         return br->dev->npinfo;
 313 }
 314
 315 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 316                                        struct sk_buff *skb)
 317 {
 318         struct netpoll *np = p->np;
 319
 320         if (np)
 321                 netpoll_send_skb(np, skb);
 322 }
 323
 324 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 325 extern void br_netpoll_disable(struct net_bridge_port *p);
 326 #else
 327 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 328 {
 329         return NULL;
 330 }
 331
 332 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 333                                        struct sk_buff *skb)
 334 {
 335 }
 336
 337 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 338 {
 339         return 0;
 340 }
 341
 342 static inline void br_netpoll_disable(struct net_bridge_port *p)
 343 {
 344 }
 345 #endif
 346
 347 /* br_fdb.c */
 348 extern int br_fdb_init(void);
 349 extern void br_fdb_fini(void);
 350 extern void br_fdb_flush(struct net_bridge *br);
 351 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 352                               const unsigned char *newaddr);
 353 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 354 extern void br_fdb_cleanup(unsigned long arg);
 355 extern void br_fdb_delete_by_port(struct net_bridge *br,
 356                                   const struct net_bridge_port *p, int do_all);
 357 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 358                                                  const unsigned char *addr);
 359 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 360 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 361                           unsigned long count, unsigned long off);
 362 extern int br_fdb_insert(struct net_bridge *br,
 363                          struct net_bridge_port *source,
 364                          const unsigned char *addr);
 365 extern void br_fdb_update(struct net_bridge *br,
 366                           struct net_bridge_port *source,
 367                           const unsigned char *addr);
 368
 369 extern int br_fdb_delete(struct ndmsg *ndm,
 370                          struct net_device *dev,
 371                          const unsigned char *addr);
 372 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
 373                       struct net_device *dev,
 374                       const unsigned char *addr,
 375                       u16 nlh_flags);
 376 extern int br_fdb_dump(struct sk_buff *skb,
 377                        struct netlink_callback *cb,
 378                        struct net_device *dev,
 379                        int idx);
 380
 381 /* br_forward.c */
 382 extern void br_deliver(const struct net_bridge_port *to,
 383                 struct sk_buff *skb);
 384 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 385 extern void br_forward(const struct net_bridge_port *to,
 386                 struct sk_buff *skb, struct sk_buff *skb0);
 387 extern int br_forward_finish(struct sk_buff *skb);
 388 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 389 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 390                              struct sk_buff *skb2);
 391
 392 /* br_if.c */
 393 extern void br_port_carrier_check(struct net_bridge_port *p);
 394 extern int br_add_bridge(struct net *net, const char *name);
 395 extern int br_del_bridge(struct net *net, const char *name);
 396 extern void br_net_exit(struct net *net);
 397 extern int br_add_if(struct net_bridge *br,
 398               struct net_device *dev);
 399 extern int br_del_if(struct net_bridge *br,
 400               struct net_device *dev);
 401 extern int br_min_mtu(const struct net_bridge *br);
 402 extern netdev_features_t br_features_recompute(struct net_bridge *br,
 403         netdev_features_t features);
 404
 405 /* br_input.c */
 406 extern int br_handle_frame_finish(struct sk_buff *skb);
 407 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 408
 409 /* br_ioctl.c */
 410 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 411 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 412
 413 /* br_multicast.c */
 414 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 415 extern unsigned int br_mdb_rehash_seq;
 416 extern int br_multicast_rcv(struct net_bridge *br,
 417                             struct net_bridge_port *port,
 418                             struct sk_buff *skb);
 419 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 420                                                struct sk_buff *skb);
 421 extern void br_multicast_add_port(struct net_bridge_port *port);
 422 extern void br_multicast_del_port(struct net_bridge_port *port);
 423 extern void br_multicast_enable_port(struct net_bridge_port *port);
 424 extern void br_multicast_disable_port(struct net_bridge_port *port);
 425 extern void br_multicast_init(struct net_bridge *br);
 426 extern void br_multicast_open(struct net_bridge *br);
 427 extern void br_multicast_stop(struct net_bridge *br);
 428 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 429                                  struct sk_buff *skb);
 430 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 431                                  struct sk_buff *skb, struct sk_buff *skb2);
 432 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 433 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 434                                         unsigned long val);
 435 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 436 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 437 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 438 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
 439                                 struct net_bridge_mdb_htable *mdb,
 440                                 struct br_ip *dst);
 441 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 442                                 struct net_bridge_port *port, struct br_ip *group);
 443 extern void br_multicast_free_pg(struct rcu_head *head);
 444 extern struct net_bridge_port_group *br_multicast_new_port_group(
 445                                 struct net_bridge_port *port,
 446                                 struct br_ip *group,
 447                                 struct net_bridge_port_group *next,
 448                                 unsigned char state);
 449 extern void br_mdb_init(void);
 450 extern void br_mdb_uninit(void);
 451 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 452                           struct br_ip *group, int type);
 453
 454 #define mlock_dereference(X, br) \
 455         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 456
 457 #if IS_ENABLED(CONFIG_IPV6)
 458 #include <net/addrconf.h>
 459 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
 460 {
 461         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
 462                 return 1;
 463         return 0;
 464 }
 465 #endif
 466
 467 static inline bool br_multicast_is_router(struct net_bridge *br)
 468 {
 469         return br->multicast_router == 2 ||
 470                (br->multicast_router == 1 &&
 471                 timer_pending(&br->multicast_router_timer));
 472 }
 473 #else
 474 static inline int br_multicast_rcv(struct net_bridge *br,
 475                                    struct net_bridge_port *port,
 476                                    struct sk_buff *skb)
 477 {
 478         return 0;
 479 }
 480
 481 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 482                                                       struct sk_buff *skb)
 483 {
 484         return NULL;
 485 }
 486
 487 static inline void br_multicast_add_port(struct net_bridge_port *port)
 488 {
 489 }
 490
 491 static inline void br_multicast_del_port(struct net_bridge_port *port)
 492 {
 493 }
 494
 495 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 496 {
 497 }
 498
 499 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 500 {
 501 }
 502
 503 static inline void br_multicast_init(struct net_bridge *br)
 504 {
 505 }
 506
 507 static inline void br_multicast_open(struct net_bridge *br)
 508 {
 509 }
 510
 511 static inline void br_multicast_stop(struct net_bridge *br)
 512 {
 513 }
 514
 515 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 516                                         struct sk_buff *skb)
 517 {
 518 }
 519
 520 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 521                                         struct sk_buff *skb,
 522                                         struct sk_buff *skb2)
 523 {
 524 }
 525 static inline bool br_multicast_is_router(struct net_bridge *br)
 526 {
 527         return 0;
 528 }
 529 #endif
 530
 531 /* br_netfilter.c */
 532 #ifdef CONFIG_BRIDGE_NETFILTER
 533 extern int br_netfilter_init(void);
 534 extern void br_netfilter_fini(void);
 535 extern void br_netfilter_rtable_init(struct net_bridge *);
 536 #else
 537 #define br_netfilter_init()     (0)
 538 #define br_netfilter_fini()     do { } while(0)
 539 #define br_netfilter_rtable_init(x)
 540 #endif
 541
 542 /* br_stp.c */
 543 extern void br_log_state(const struct net_bridge_port *p);
 544 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 545                                            u16 port_no);
 546 extern void br_init_port(struct net_bridge_port *p);
 547 extern void br_become_designated_port(struct net_bridge_port *p);
 548
 549 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 550 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 551 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 552
 553
 554 /* br_stp_if.c */
 555 extern void br_stp_enable_bridge(struct net_bridge *br);
 556 extern void br_stp_disable_bridge(struct net_bridge *br);
 557 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 558 extern void br_stp_enable_port(struct net_bridge_port *p);
 559 extern void br_stp_disable_port(struct net_bridge_port *p);
 560 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 561 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 562 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 563                                        u16 newprio);
 564 extern int br_stp_set_port_priority(struct net_bridge_port *p,
 565                                     unsigned long newprio);
 566 extern int br_stp_set_path_cost(struct net_bridge_port *p,
 567                                 unsigned long path_cost);
 568 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 569
 570 /* br_stp_bpdu.c */
 571 struct stp_proto;
 572 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 573                        struct net_device *dev);
 574
 575 /* br_stp_timer.c */
 576 extern void br_stp_timer_init(struct net_bridge *br);
 577 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 578 extern unsigned long br_timer_value(const struct timer_list *timer);
 579
 580 /* br.c */
 581 #if IS_ENABLED(CONFIG_ATM_LANE)
 582 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 583 #endif
 584
 585 /* br_netlink.c */
 586 extern struct rtnl_link_ops br_link_ops;
 587 extern int br_netlink_init(void);
 588 extern void br_netlink_fini(void);
 589 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 590 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
 591 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 592                       struct net_device *dev);
 593
 594 #ifdef CONFIG_SYSFS
 595 /* br_sysfs_if.c */
 596 extern const struct sysfs_ops brport_sysfs_ops;
 597 extern int br_sysfs_addif(struct net_bridge_port *p);
 598 extern int br_sysfs_renameif(struct net_bridge_port *p);
 599
 600 /* br_sysfs_br.c */
 601 extern int br_sysfs_addbr(struct net_device *dev);
 602 extern void br_sysfs_delbr(struct net_device *dev);
 603
 604 #else
 605
 606 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
 607 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
 608 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
 609 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 610 #endif /* CONFIG_SYSFS */
 611
 612 #endif