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   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 <net/route.h>
  19
  20 #define BR_HASH_BITS 8
  21 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  22
  23 #define BR_HOLD_TIME (1*HZ)
  24
  25 #define BR_PORT_BITS    10
  26 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  27
  28 #define BR_VERSION      "2.3"
  29
  30 /* Path to usermode spanning tree program */
  31 #define BR_STP_PROG     "/sbin/bridge-stp"
  32
  33 typedef struct bridge_id bridge_id;
  34 typedef struct mac_addr mac_addr;
  35 typedef __u16 port_id;
  36
  37 struct bridge_id
  38 {
  39         unsigned char   prio[2];
  40         unsigned char   addr[6];
  41 };
  42
  43 struct mac_addr
  44 {
  45         unsigned char   addr[6];
  46 };
  47
  48 struct br_ip
  49 {
  50         union {
  51                 __be32  ip4;
  52 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  53                 struct in6_addr ip6;
  54 #endif
  55         } u;
  56         __be16          proto;
  57 };
  58
  59 struct net_bridge_fdb_entry
  60 {
  61         struct hlist_node               hlist;
  62         struct net_bridge_port          *dst;
  63
  64         struct rcu_head                 rcu;
  65         unsigned long                   ageing_timer;
  66         mac_addr                        addr;
  67         unsigned char                   is_local;
  68         unsigned char                   is_static;
  69 };
  70
  71 struct net_bridge_port_group {
  72         struct net_bridge_port          *port;
  73         struct net_bridge_port_group    *next;
  74         struct hlist_node               mglist;
  75         struct rcu_head                 rcu;
  76         struct timer_list               timer;
  77         struct timer_list               query_timer;
  78         struct br_ip                    addr;
  79         u32                             queries_sent;
  80 };
  81
  82 struct net_bridge_mdb_entry
  83 {
  84         struct hlist_node               hlist[2];
  85         struct hlist_node               mglist;
  86         struct net_bridge               *br;
  87         struct net_bridge_port_group    *ports;
  88         struct rcu_head                 rcu;
  89         struct timer_list               timer;
  90         struct timer_list               query_timer;
  91         struct br_ip                    addr;
  92         u32                             queries_sent;
  93 };
  94
  95 struct net_bridge_mdb_htable
  96 {
  97         struct hlist_head               *mhash;
  98         struct rcu_head                 rcu;
  99         struct net_bridge_mdb_htable    *old;
 100         u32                             size;
 101         u32                             max;
 102         u32                             secret;
 103         u32                             ver;
 104 };
 105
 106 struct net_bridge_port
 107 {
 108         struct net_bridge               *br;
 109         struct net_device               *dev;
 110         struct list_head                list;
 111
 112         /* STP */
 113         u8                              priority;
 114         u8                              state;
 115         u16                             port_no;
 116         unsigned char                   topology_change_ack;
 117         unsigned char                   config_pending;
 118         port_id                         port_id;
 119         port_id                         designated_port;
 120         bridge_id                       designated_root;
 121         bridge_id                       designated_bridge;
 122         u32                             path_cost;
 123         u32                             designated_cost;
 124
 125         struct timer_list               forward_delay_timer;
 126         struct timer_list               hold_timer;
 127         struct timer_list               message_age_timer;
 128         struct kobject                  kobj;
 129         struct rcu_head                 rcu;
 130
 131         unsigned long                   flags;
 132 #define BR_HAIRPIN_MODE         0x00000001
 133
 134 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 135         u32                             multicast_startup_queries_sent;
 136         unsigned char                   multicast_router;
 137         struct timer_list               multicast_router_timer;
 138         struct timer_list               multicast_query_timer;
 139         struct hlist_head               mglist;
 140         struct hlist_node               rlist;
 141 #endif
 142 };
 143
 144 struct br_cpu_netstats {
 145         unsigned long   rx_packets;
 146         unsigned long   rx_bytes;
 147         unsigned long   tx_packets;
 148         unsigned long   tx_bytes;
 149 };
 150
 151 struct net_bridge
 152 {
 153         spinlock_t                      lock;
 154         struct list_head                port_list;
 155         struct net_device               *dev;
 156
 157         struct br_cpu_netstats __percpu *stats;
 158         spinlock_t                      hash_lock;
 159         struct hlist_head               hash[BR_HASH_SIZE];
 160         unsigned long                   feature_mask;
 161 #ifdef CONFIG_BRIDGE_NETFILTER
 162         struct rtable                   fake_rtable;
 163 #endif
 164         unsigned long                   flags;
 165 #define BR_SET_MAC_ADDR         0x00000001
 166
 167         /* STP */
 168         bridge_id                       designated_root;
 169         bridge_id                       bridge_id;
 170         u32                             root_path_cost;
 171         unsigned long                   max_age;
 172         unsigned long                   hello_time;
 173         unsigned long                   forward_delay;
 174         unsigned long                   bridge_max_age;
 175         unsigned long                   ageing_time;
 176         unsigned long                   bridge_hello_time;
 177         unsigned long                   bridge_forward_delay;
 178
 179         u8                              group_addr[ETH_ALEN];
 180         u16                             root_port;
 181
 182         enum {
 183                 BR_NO_STP,              /* no spanning tree */
 184                 BR_KERNEL_STP,          /* old STP in kernel */
 185                 BR_USER_STP,            /* new RSTP in userspace */
 186         } stp_enabled;
 187
 188         unsigned char                   topology_change;
 189         unsigned char                   topology_change_detected;
 190
 191 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 192         unsigned char                   multicast_router;
 193
 194         u8                              multicast_disabled:1;
 195
 196         u32                             hash_elasticity;
 197         u32                             hash_max;
 198
 199         u32                             multicast_last_member_count;
 200         u32                             multicast_startup_queries_sent;
 201         u32                             multicast_startup_query_count;
 202
 203         unsigned long                   multicast_last_member_interval;
 204         unsigned long                   multicast_membership_interval;
 205         unsigned long                   multicast_querier_interval;
 206         unsigned long                   multicast_query_interval;
 207         unsigned long                   multicast_query_response_interval;
 208         unsigned long                   multicast_startup_query_interval;
 209
 210         spinlock_t                      multicast_lock;
 211         struct net_bridge_mdb_htable    *mdb;
 212         struct hlist_head               router_list;
 213         struct hlist_head               mglist;
 214
 215         struct timer_list               multicast_router_timer;
 216         struct timer_list               multicast_querier_timer;
 217         struct timer_list               multicast_query_timer;
 218 #endif
 219
 220         struct timer_list               hello_timer;
 221         struct timer_list               tcn_timer;
 222         struct timer_list               topology_change_timer;
 223         struct timer_list               gc_timer;
 224         struct kobject                  *ifobj;
 225 };
 226
 227 struct br_input_skb_cb {
 228         struct net_device *brdev;
 229 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 230         int igmp;
 231         int mrouters_only;
 232 #endif
 233 };
 234
 235 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 236
 237 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 238 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 239 #else
 240 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 241 #endif
 242
 243 #define br_printk(level, br, format, args...)   \
 244         printk(level "%s: " format, (br)->dev->name, ##args)
 245
 246 #define br_err(__br, format, args...)                   \
 247         br_printk(KERN_ERR, __br, format, ##args)
 248 #define br_warn(__br, format, args...)                  \
 249         br_printk(KERN_WARNING, __br, format, ##args)
 250 #define br_notice(__br, format, args...)                \
 251         br_printk(KERN_NOTICE, __br, format, ##args)
 252 #define br_info(__br, format, args...)                  \
 253         br_printk(KERN_INFO, __br, format, ##args)
 254
 255 #define br_debug(br, format, args...)                   \
 256         pr_debug("%s: " format,  (br)->dev->name, ##args)
 257
 258 extern struct notifier_block br_device_notifier;
 259 extern const u8 br_group_address[ETH_ALEN];
 260
 261 /* called under bridge lock */
 262 static inline int br_is_root_bridge(const struct net_bridge *br)
 263 {
 264         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 265 }
 266
 267 /* br_device.c */
 268 extern void br_dev_setup(struct net_device *dev);
 269 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 270                                struct net_device *dev);
 271 #ifdef CONFIG_NET_POLL_CONTROLLER
 272 extern void br_netpoll_cleanup(struct net_device *dev);
 273 extern void br_netpoll_enable(struct net_bridge *br,
 274                               struct net_device *dev);
 275 extern void br_netpoll_disable(struct net_bridge *br,
 276                                struct net_device *dev);
 277 #else
 278 #define br_netpoll_cleanup(br)
 279 #define br_netpoll_enable(br, dev)
 280 #define br_netpoll_disable(br, dev)
 281
 282 #endif
 283
 284 /* br_fdb.c */
 285 extern int br_fdb_init(void);
 286 extern void br_fdb_fini(void);
 287 extern void br_fdb_flush(struct net_bridge *br);
 288 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 289                               const unsigned char *newaddr);
 290 extern void br_fdb_cleanup(unsigned long arg);
 291 extern void br_fdb_delete_by_port(struct net_bridge *br,
 292                                   const struct net_bridge_port *p, int do_all);
 293 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 294                                                  const unsigned char *addr);
 295 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 296 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 297                           unsigned long count, unsigned long off);
 298 extern int br_fdb_insert(struct net_bridge *br,
 299                          struct net_bridge_port *source,
 300                          const unsigned char *addr);
 301 extern void br_fdb_update(struct net_bridge *br,
 302                           struct net_bridge_port *source,
 303                           const unsigned char *addr);
 304
 305 /* br_forward.c */
 306 extern void br_deliver(const struct net_bridge_port *to,
 307                 struct sk_buff *skb);
 308 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 309 extern void br_forward(const struct net_bridge_port *to,
 310                 struct sk_buff *skb, struct sk_buff *skb0);
 311 extern int br_forward_finish(struct sk_buff *skb);
 312 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 313 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 314                              struct sk_buff *skb2);
 315
 316 /* br_if.c */
 317 extern void br_port_carrier_check(struct net_bridge_port *p);
 318 extern int br_add_bridge(struct net *net, const char *name);
 319 extern int br_del_bridge(struct net *net, const char *name);
 320 extern void br_net_exit(struct net *net);
 321 extern int br_add_if(struct net_bridge *br,
 322               struct net_device *dev);
 323 extern int br_del_if(struct net_bridge *br,
 324               struct net_device *dev);
 325 extern int br_min_mtu(const struct net_bridge *br);
 326 extern void br_features_recompute(struct net_bridge *br);
 327
 328 /* br_input.c */
 329 extern int br_handle_frame_finish(struct sk_buff *skb);
 330 extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
 331                                        struct sk_buff *skb);
 332
 333 /* br_ioctl.c */
 334 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 335 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 336
 337 /* br_multicast.c */
 338 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 339 extern int br_multicast_rcv(struct net_bridge *br,
 340                             struct net_bridge_port *port,
 341                             struct sk_buff *skb);
 342 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 343                                                struct sk_buff *skb);
 344 extern void br_multicast_add_port(struct net_bridge_port *port);
 345 extern void br_multicast_del_port(struct net_bridge_port *port);
 346 extern void br_multicast_enable_port(struct net_bridge_port *port);
 347 extern void br_multicast_disable_port(struct net_bridge_port *port);
 348 extern void br_multicast_init(struct net_bridge *br);
 349 extern void br_multicast_open(struct net_bridge *br);
 350 extern void br_multicast_stop(struct net_bridge *br);
 351 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 352                                  struct sk_buff *skb);
 353 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 354                                  struct sk_buff *skb, struct sk_buff *skb2);
 355 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 356 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 357                                         unsigned long val);
 358 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 359 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 360
 361 static inline bool br_multicast_is_router(struct net_bridge *br)
 362 {
 363         return br->multicast_router == 2 ||
 364                (br->multicast_router == 1 &&
 365                 timer_pending(&br->multicast_router_timer));
 366 }
 367 #else
 368 static inline int br_multicast_rcv(struct net_bridge *br,
 369                                    struct net_bridge_port *port,
 370                                    struct sk_buff *skb)
 371 {
 372         return 0;
 373 }
 374
 375 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 376                                                       struct sk_buff *skb)
 377 {
 378         return NULL;
 379 }
 380
 381 static inline void br_multicast_add_port(struct net_bridge_port *port)
 382 {
 383 }
 384
 385 static inline void br_multicast_del_port(struct net_bridge_port *port)
 386 {
 387 }
 388
 389 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 390 {
 391 }
 392
 393 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 394 {
 395 }
 396
 397 static inline void br_multicast_init(struct net_bridge *br)
 398 {
 399 }
 400
 401 static inline void br_multicast_open(struct net_bridge *br)
 402 {
 403 }
 404
 405 static inline void br_multicast_stop(struct net_bridge *br)
 406 {
 407 }
 408
 409 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 410                                         struct sk_buff *skb)
 411 {
 412 }
 413
 414 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 415                                         struct sk_buff *skb,
 416                                         struct sk_buff *skb2)
 417 {
 418 }
 419 static inline bool br_multicast_is_router(struct net_bridge *br)
 420 {
 421         return 0;
 422 }
 423 #endif
 424
 425 /* br_netfilter.c */
 426 #ifdef CONFIG_BRIDGE_NETFILTER
 427 extern int br_netfilter_init(void);
 428 extern void br_netfilter_fini(void);
 429 extern void br_netfilter_rtable_init(struct net_bridge *);
 430 #else
 431 #define br_netfilter_init()     (0)
 432 #define br_netfilter_fini()     do { } while(0)
 433 #define br_netfilter_rtable_init(x)
 434 #endif
 435
 436 /* br_stp.c */
 437 extern void br_log_state(const struct net_bridge_port *p);
 438 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 439                                            u16 port_no);
 440 extern void br_init_port(struct net_bridge_port *p);
 441 extern void br_become_designated_port(struct net_bridge_port *p);
 442
 443 /* br_stp_if.c */
 444 extern void br_stp_enable_bridge(struct net_bridge *br);
 445 extern void br_stp_disable_bridge(struct net_bridge *br);
 446 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 447 extern void br_stp_enable_port(struct net_bridge_port *p);
 448 extern void br_stp_disable_port(struct net_bridge_port *p);
 449 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 450 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 451 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 452                                        u16 newprio);
 453 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 454                                      u8 newprio);
 455 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 456                                  u32 path_cost);
 457 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 458
 459 /* br_stp_bpdu.c */
 460 struct stp_proto;
 461 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 462                        struct net_device *dev);
 463
 464 /* br_stp_timer.c */
 465 extern void br_stp_timer_init(struct net_bridge *br);
 466 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 467 extern unsigned long br_timer_value(const struct timer_list *timer);
 468
 469 /* br.c */
 470 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
 471 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 472 #endif
 473
 474 /* br_netlink.c */
 475 extern int br_netlink_init(void);
 476 extern void br_netlink_fini(void);
 477 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 478
 479 #ifdef CONFIG_SYSFS
 480 /* br_sysfs_if.c */
 481 extern const struct sysfs_ops brport_sysfs_ops;
 482 extern int br_sysfs_addif(struct net_bridge_port *p);
 483
 484 /* br_sysfs_br.c */
 485 extern int br_sysfs_addbr(struct net_device *dev);
 486 extern void br_sysfs_delbr(struct net_device *dev);
 487
 488 #else
 489
 490 #define br_sysfs_addif(p)       (0)
 491 #define br_sysfs_addbr(dev)     (0)
 492 #define br_sysfs_delbr(dev)     do { } while(0)
 493 #endif /* CONFIG_SYSFS */
 494
 495 #endif