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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 extern struct notifier_block br_device_notifier;
 244 extern const u8 br_group_address[ETH_ALEN];
 245
 246 /* called under bridge lock */
 247 static inline int br_is_root_bridge(const struct net_bridge *br)
 248 {
 249         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 250 }
 251
 252 /* br_device.c */
 253 extern void br_dev_setup(struct net_device *dev);
 254 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 255                                struct net_device *dev);
 256
 257 /* br_fdb.c */
 258 extern int br_fdb_init(void);
 259 extern void br_fdb_fini(void);
 260 extern void br_fdb_flush(struct net_bridge *br);
 261 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 262                               const unsigned char *newaddr);
 263 extern void br_fdb_cleanup(unsigned long arg);
 264 extern void br_fdb_delete_by_port(struct net_bridge *br,
 265                                   const struct net_bridge_port *p, int do_all);
 266 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 267                                                  const unsigned char *addr);
 268 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 269 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 270                           unsigned long count, unsigned long off);
 271 extern int br_fdb_insert(struct net_bridge *br,
 272                          struct net_bridge_port *source,
 273                          const unsigned char *addr);
 274 extern void br_fdb_update(struct net_bridge *br,
 275                           struct net_bridge_port *source,
 276                           const unsigned char *addr);
 277
 278 /* br_forward.c */
 279 extern void br_deliver(const struct net_bridge_port *to,
 280                 struct sk_buff *skb);
 281 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 282 extern void br_forward(const struct net_bridge_port *to,
 283                 struct sk_buff *skb, struct sk_buff *skb0);
 284 extern int br_forward_finish(struct sk_buff *skb);
 285 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 286 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 287                              struct sk_buff *skb2);
 288
 289 /* br_if.c */
 290 extern void br_port_carrier_check(struct net_bridge_port *p);
 291 extern int br_add_bridge(struct net *net, const char *name);
 292 extern int br_del_bridge(struct net *net, const char *name);
 293 extern void br_net_exit(struct net *net);
 294 extern int br_add_if(struct net_bridge *br,
 295               struct net_device *dev);
 296 extern int br_del_if(struct net_bridge *br,
 297               struct net_device *dev);
 298 extern int br_min_mtu(const struct net_bridge *br);
 299 extern void br_features_recompute(struct net_bridge *br);
 300
 301 /* br_input.c */
 302 extern int br_handle_frame_finish(struct sk_buff *skb);
 303 extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
 304                                        struct sk_buff *skb);
 305
 306 /* br_ioctl.c */
 307 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 308 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 309
 310 /* br_multicast.c */
 311 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 312 extern int br_multicast_rcv(struct net_bridge *br,
 313                             struct net_bridge_port *port,
 314                             struct sk_buff *skb);
 315 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 316                                                struct sk_buff *skb);
 317 extern void br_multicast_add_port(struct net_bridge_port *port);
 318 extern void br_multicast_del_port(struct net_bridge_port *port);
 319 extern void br_multicast_enable_port(struct net_bridge_port *port);
 320 extern void br_multicast_disable_port(struct net_bridge_port *port);
 321 extern void br_multicast_init(struct net_bridge *br);
 322 extern void br_multicast_open(struct net_bridge *br);
 323 extern void br_multicast_stop(struct net_bridge *br);
 324 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 325                                  struct sk_buff *skb);
 326 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 327                                  struct sk_buff *skb, struct sk_buff *skb2);
 328 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 329 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 330                                         unsigned long val);
 331 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 332 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 333
 334 static inline bool br_multicast_is_router(struct net_bridge *br)
 335 {
 336         return br->multicast_router == 2 ||
 337                (br->multicast_router == 1 &&
 338                 timer_pending(&br->multicast_router_timer));
 339 }
 340 #else
 341 static inline int br_multicast_rcv(struct net_bridge *br,
 342                                    struct net_bridge_port *port,
 343                                    struct sk_buff *skb)
 344 {
 345         return 0;
 346 }
 347
 348 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 349                                                       struct sk_buff *skb)
 350 {
 351         return NULL;
 352 }
 353
 354 static inline void br_multicast_add_port(struct net_bridge_port *port)
 355 {
 356 }
 357
 358 static inline void br_multicast_del_port(struct net_bridge_port *port)
 359 {
 360 }
 361
 362 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 363 {
 364 }
 365
 366 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 367 {
 368 }
 369
 370 static inline void br_multicast_init(struct net_bridge *br)
 371 {
 372 }
 373
 374 static inline void br_multicast_open(struct net_bridge *br)
 375 {
 376 }
 377
 378 static inline void br_multicast_stop(struct net_bridge *br)
 379 {
 380 }
 381
 382 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 383                                         struct sk_buff *skb)
 384 {
 385 }
 386
 387 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 388                                         struct sk_buff *skb,
 389                                         struct sk_buff *skb2)
 390 {
 391 }
 392 static inline bool br_multicast_is_router(struct net_bridge *br)
 393 {
 394         return 0;
 395 }
 396 #endif
 397
 398 /* br_netfilter.c */
 399 #ifdef CONFIG_BRIDGE_NETFILTER
 400 extern int br_netfilter_init(void);
 401 extern void br_netfilter_fini(void);
 402 extern void br_netfilter_rtable_init(struct net_bridge *);
 403 #else
 404 #define br_netfilter_init()     (0)
 405 #define br_netfilter_fini()     do { } while(0)
 406 #define br_netfilter_rtable_init(x)
 407 #endif
 408
 409 /* br_stp.c */
 410 extern void br_log_state(const struct net_bridge_port *p);
 411 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 412                                            u16 port_no);
 413 extern void br_init_port(struct net_bridge_port *p);
 414 extern void br_become_designated_port(struct net_bridge_port *p);
 415
 416 /* br_stp_if.c */
 417 extern void br_stp_enable_bridge(struct net_bridge *br);
 418 extern void br_stp_disable_bridge(struct net_bridge *br);
 419 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 420 extern void br_stp_enable_port(struct net_bridge_port *p);
 421 extern void br_stp_disable_port(struct net_bridge_port *p);
 422 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 423 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 424 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 425                                        u16 newprio);
 426 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 427                                      u8 newprio);
 428 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 429                                  u32 path_cost);
 430 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 431
 432 /* br_stp_bpdu.c */
 433 struct stp_proto;
 434 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 435                        struct net_device *dev);
 436
 437 /* br_stp_timer.c */
 438 extern void br_stp_timer_init(struct net_bridge *br);
 439 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 440 extern unsigned long br_timer_value(const struct timer_list *timer);
 441
 442 /* br.c */
 443 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
 444 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 445 #endif
 446
 447 /* br_netlink.c */
 448 extern int br_netlink_init(void);
 449 extern void br_netlink_fini(void);
 450 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 451
 452 #ifdef CONFIG_SYSFS
 453 /* br_sysfs_if.c */
 454 extern const struct sysfs_ops brport_sysfs_ops;
 455 extern int br_sysfs_addif(struct net_bridge_port *p);
 456
 457 /* br_sysfs_br.c */
 458 extern int br_sysfs_addbr(struct net_device *dev);
 459 extern void br_sysfs_delbr(struct net_device *dev);
 460
 461 #else
 462
 463 #define br_sysfs_addif(p)       (0)
 464 #define br_sysfs_addbr(dev)     (0)
 465 #define br_sysfs_delbr(dev)     do { } while(0)
 466 #endif /* CONFIG_SYSFS */
 467
 468 #endif