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