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