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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 net_bridge
 134 {
 135         spinlock_t                      lock;
 136         struct list_head                port_list;
 137         struct net_device               *dev;
 138         spinlock_t                      hash_lock;
 139         struct hlist_head               hash[BR_HASH_SIZE];
 140         unsigned long                   feature_mask;
 141 #ifdef CONFIG_BRIDGE_NETFILTER
 142         struct rtable                   fake_rtable;
 143 #endif
 144         unsigned long                   flags;
 145 #define BR_SET_MAC_ADDR         0x00000001
 146
 147         /* STP */
 148         bridge_id                       designated_root;
 149         bridge_id                       bridge_id;
 150         u32                             root_path_cost;
 151         unsigned long                   max_age;
 152         unsigned long                   hello_time;
 153         unsigned long                   forward_delay;
 154         unsigned long                   bridge_max_age;
 155         unsigned long                   ageing_time;
 156         unsigned long                   bridge_hello_time;
 157         unsigned long                   bridge_forward_delay;
 158
 159         u8                              group_addr[ETH_ALEN];
 160         u16                             root_port;
 161
 162         enum {
 163                 BR_NO_STP,              /* no spanning tree */
 164                 BR_KERNEL_STP,          /* old STP in kernel */
 165                 BR_USER_STP,            /* new RSTP in userspace */
 166         } stp_enabled;
 167
 168         unsigned char                   topology_change;
 169         unsigned char                   topology_change_detected;
 170
 171 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 172         unsigned char                   multicast_router;
 173
 174         u8                              multicast_disabled:1;
 175
 176         u32                             hash_elasticity;
 177         u32                             hash_max;
 178
 179         u32                             multicast_last_member_count;
 180         u32                             multicast_startup_queries_sent;
 181         u32                             multicast_startup_query_count;
 182
 183         unsigned long                   multicast_last_member_interval;
 184         unsigned long                   multicast_membership_interval;
 185         unsigned long                   multicast_querier_interval;
 186         unsigned long                   multicast_query_interval;
 187         unsigned long                   multicast_query_response_interval;
 188         unsigned long                   multicast_startup_query_interval;
 189
 190         spinlock_t                      multicast_lock;
 191         struct net_bridge_mdb_htable    *mdb;
 192         struct hlist_head               router_list;
 193         struct hlist_head               mglist;
 194
 195         struct timer_list               multicast_router_timer;
 196         struct timer_list               multicast_querier_timer;
 197         struct timer_list               multicast_query_timer;
 198 #endif
 199
 200         struct timer_list               hello_timer;
 201         struct timer_list               tcn_timer;
 202         struct timer_list               topology_change_timer;
 203         struct timer_list               gc_timer;
 204         struct kobject                  *ifobj;
 205 };
 206
 207 struct br_input_skb_cb {
 208         struct net_device *brdev;
 209         int igmp;
 210         int mrouters_only;
 211 };
 212
 213 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 214
 215 extern struct notifier_block br_device_notifier;
 216 extern const u8 br_group_address[ETH_ALEN];
 217
 218 /* called under bridge lock */
 219 static inline int br_is_root_bridge(const struct net_bridge *br)
 220 {
 221         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 222 }
 223
 224 /* br_device.c */
 225 extern void br_dev_setup(struct net_device *dev);
 226 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 227                                struct net_device *dev);
 228
 229 /* br_fdb.c */
 230 extern int br_fdb_init(void);
 231 extern void br_fdb_fini(void);
 232 extern void br_fdb_flush(struct net_bridge *br);
 233 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 234                               const unsigned char *newaddr);
 235 extern void br_fdb_cleanup(unsigned long arg);
 236 extern void br_fdb_delete_by_port(struct net_bridge *br,
 237                                   const struct net_bridge_port *p, int do_all);
 238 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 239                                                  const unsigned char *addr);
 240 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 241 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 242                           unsigned long count, unsigned long off);
 243 extern int br_fdb_insert(struct net_bridge *br,
 244                          struct net_bridge_port *source,
 245                          const unsigned char *addr);
 246 extern void br_fdb_update(struct net_bridge *br,
 247                           struct net_bridge_port *source,
 248                           const unsigned char *addr);
 249
 250 /* br_forward.c */
 251 extern void br_deliver(const struct net_bridge_port *to,
 252                 struct sk_buff *skb);
 253 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 254 extern void br_forward(const struct net_bridge_port *to,
 255                 struct sk_buff *skb);
 256 extern int br_forward_finish(struct sk_buff *skb);
 257 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 258 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 259                              struct sk_buff *skb2);
 260
 261 /* br_if.c */
 262 extern void br_port_carrier_check(struct net_bridge_port *p);
 263 extern int br_add_bridge(struct net *net, const char *name);
 264 extern int br_del_bridge(struct net *net, const char *name);
 265 extern void br_net_exit(struct net *net);
 266 extern int br_add_if(struct net_bridge *br,
 267               struct net_device *dev);
 268 extern int br_del_if(struct net_bridge *br,
 269               struct net_device *dev);
 270 extern int br_min_mtu(const struct net_bridge *br);
 271 extern void br_features_recompute(struct net_bridge *br);
 272
 273 /* br_input.c */
 274 extern int br_handle_frame_finish(struct sk_buff *skb);
 275 extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
 276                                        struct sk_buff *skb);
 277
 278 /* br_ioctl.c */
 279 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 280 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 281
 282 /* br_multicast.c */
 283 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 284 extern int br_multicast_rcv(struct net_bridge *br,
 285                             struct net_bridge_port *port,
 286                             struct sk_buff *skb);
 287 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 288                                                struct sk_buff *skb);
 289 extern void br_multicast_add_port(struct net_bridge_port *port);
 290 extern void br_multicast_del_port(struct net_bridge_port *port);
 291 extern void br_multicast_enable_port(struct net_bridge_port *port);
 292 extern void br_multicast_disable_port(struct net_bridge_port *port);
 293 extern void br_multicast_init(struct net_bridge *br);
 294 extern void br_multicast_open(struct net_bridge *br);
 295 extern void br_multicast_stop(struct net_bridge *br);
 296 #else
 297 static inline int br_multicast_rcv(struct net_bridge *br,
 298                                    struct net_bridge_port *port,
 299                                    struct sk_buff *skb)
 300 {
 301         return 0;
 302 }
 303
 304 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 305                                                       struct sk_buff *skb)
 306 {
 307         return NULL;
 308 }
 309
 310 static inline void br_multicast_add_port(struct net_bridge_port *port)
 311 {
 312 }
 313
 314 static inline void br_multicast_del_port(struct net_bridge_port *port)
 315 {
 316 }
 317
 318 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 319 {
 320 }
 321
 322 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 323 {
 324 }
 325
 326 static inline void br_multicast_init(struct net_bridge *br)
 327 {
 328 }
 329
 330 static inline void br_multicast_open(struct net_bridge *br)
 331 {
 332 }
 333
 334 static inline void br_multicast_stop(struct net_bridge *br)
 335 {
 336 }
 337 #endif
 338
 339 static inline bool br_multicast_is_router(struct net_bridge *br)
 340 {
 341         return br->multicast_router == 2 ||
 342                (br->multicast_router == 1 &&
 343                 timer_pending(&br->multicast_router_timer));
 344 }
 345
 346 /* br_netfilter.c */
 347 #ifdef CONFIG_BRIDGE_NETFILTER
 348 extern int br_netfilter_init(void);
 349 extern void br_netfilter_fini(void);
 350 extern void br_netfilter_rtable_init(struct net_bridge *);
 351 #else
 352 #define br_netfilter_init()     (0)
 353 #define br_netfilter_fini()     do { } while(0)
 354 #define br_netfilter_rtable_init(x)
 355 #endif
 356
 357 /* br_stp.c */
 358 extern void br_log_state(const struct net_bridge_port *p);
 359 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 360                                            u16 port_no);
 361 extern void br_init_port(struct net_bridge_port *p);
 362 extern void br_become_designated_port(struct net_bridge_port *p);
 363
 364 /* br_stp_if.c */
 365 extern void br_stp_enable_bridge(struct net_bridge *br);
 366 extern void br_stp_disable_bridge(struct net_bridge *br);
 367 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 368 extern void br_stp_enable_port(struct net_bridge_port *p);
 369 extern void br_stp_disable_port(struct net_bridge_port *p);
 370 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 371 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 372 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 373                                        u16 newprio);
 374 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 375                                      u8 newprio);
 376 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 377                                  u32 path_cost);
 378 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 379
 380 /* br_stp_bpdu.c */
 381 struct stp_proto;
 382 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 383                        struct net_device *dev);
 384
 385 /* br_stp_timer.c */
 386 extern void br_stp_timer_init(struct net_bridge *br);
 387 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 388 extern unsigned long br_timer_value(const struct timer_list *timer);
 389
 390 /* br.c */
 391 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
 392 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 393 #endif
 394
 395 /* br_netlink.c */
 396 extern int br_netlink_init(void);
 397 extern void br_netlink_fini(void);
 398 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 399
 400 #ifdef CONFIG_SYSFS
 401 /* br_sysfs_if.c */
 402 extern struct sysfs_ops brport_sysfs_ops;
 403 extern int br_sysfs_addif(struct net_bridge_port *p);
 404
 405 /* br_sysfs_br.c */
 406 extern int br_sysfs_addbr(struct net_device *dev);
 407 extern void br_sysfs_delbr(struct net_device *dev);
 408
 409 #else
 410
 411 #define br_sysfs_addif(p)       (0)
 412 #define br_sysfs_addbr(dev)     (0)
 413 #define br_sysfs_delbr(dev)     do { } while(0)
 414 #endif /* CONFIG_SYSFS */
 415
 416 #endif