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 <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 extern bool br_devices_support_netpoll(struct net_bridge *br);
 257 extern void br_netpoll_cleanup(struct net_device *br_dev);
 258
 259 /* br_fdb.c */
 260 extern int br_fdb_init(void);
 261 extern void br_fdb_fini(void);
 262 extern void br_fdb_flush(struct net_bridge *br);
 263 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 264                               const unsigned char *newaddr);
 265 extern void br_fdb_cleanup(unsigned long arg);
 266 extern void br_fdb_delete_by_port(struct net_bridge *br,
 267                                   const struct net_bridge_port *p, int do_all);
 268 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 269                                                  const unsigned char *addr);
 270 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 271 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 272                           unsigned long count, unsigned long off);
 273 extern int br_fdb_insert(struct net_bridge *br,
 274                          struct net_bridge_port *source,
 275                          const unsigned char *addr);
 276 extern void br_fdb_update(struct net_bridge *br,
 277                           struct net_bridge_port *source,
 278                           const unsigned char *addr);
 279
 280 /* br_forward.c */
 281 extern void br_deliver(const struct net_bridge_port *to,
 282                 struct sk_buff *skb);
 283 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 284 extern void br_forward(const struct net_bridge_port *to,
 285                 struct sk_buff *skb, struct sk_buff *skb0);
 286 extern int br_forward_finish(struct sk_buff *skb);
 287 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 288 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 289                              struct sk_buff *skb2);
 290
 291 /* br_if.c */
 292 extern void br_port_carrier_check(struct net_bridge_port *p);
 293 extern int br_add_bridge(struct net *net, const char *name);
 294 extern int br_del_bridge(struct net *net, const char *name);
 295 extern void br_net_exit(struct net *net);
 296 extern int br_add_if(struct net_bridge *br,
 297               struct net_device *dev);
 298 extern int br_del_if(struct net_bridge *br,
 299               struct net_device *dev);
 300 extern int br_min_mtu(const struct net_bridge *br);
 301 extern void br_features_recompute(struct net_bridge *br);
 302
 303 /* br_input.c */
 304 extern int br_handle_frame_finish(struct sk_buff *skb);
 305 extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
 306                                        struct sk_buff *skb);
 307
 308 /* br_ioctl.c */
 309 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 310 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 311
 312 /* br_multicast.c */
 313 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 314 extern int br_multicast_rcv(struct net_bridge *br,
 315                             struct net_bridge_port *port,
 316                             struct sk_buff *skb);
 317 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 318                                                struct sk_buff *skb);
 319 extern void br_multicast_add_port(struct net_bridge_port *port);
 320 extern void br_multicast_del_port(struct net_bridge_port *port);
 321 extern void br_multicast_enable_port(struct net_bridge_port *port);
 322 extern void br_multicast_disable_port(struct net_bridge_port *port);
 323 extern void br_multicast_init(struct net_bridge *br);
 324 extern void br_multicast_open(struct net_bridge *br);
 325 extern void br_multicast_stop(struct net_bridge *br);
 326 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 327                                  struct sk_buff *skb);
 328 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 329                                  struct sk_buff *skb, struct sk_buff *skb2);
 330 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 331 extern int br_multicast_set_port_router(struct net_bridge_port *p,
 332                                         unsigned long val);
 333 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 334 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 335
 336 static inline bool br_multicast_is_router(struct net_bridge *br)
 337 {
 338         return br->multicast_router == 2 ||
 339                (br->multicast_router == 1 &&
 340                 timer_pending(&br->multicast_router_timer));
 341 }
 342 #else
 343 static inline int br_multicast_rcv(struct net_bridge *br,
 344                                    struct net_bridge_port *port,
 345                                    struct sk_buff *skb)
 346 {
 347         return 0;
 348 }
 349
 350 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 351                                                       struct sk_buff *skb)
 352 {
 353         return NULL;
 354 }
 355
 356 static inline void br_multicast_add_port(struct net_bridge_port *port)
 357 {
 358 }
 359
 360 static inline void br_multicast_del_port(struct net_bridge_port *port)
 361 {
 362 }
 363
 364 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 365 {
 366 }
 367
 368 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 369 {
 370 }
 371
 372 static inline void br_multicast_init(struct net_bridge *br)
 373 {
 374 }
 375
 376 static inline void br_multicast_open(struct net_bridge *br)
 377 {
 378 }
 379
 380 static inline void br_multicast_stop(struct net_bridge *br)
 381 {
 382 }
 383
 384 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 385                                         struct sk_buff *skb)
 386 {
 387 }
 388
 389 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 390                                         struct sk_buff *skb,
 391                                         struct sk_buff *skb2)
 392 {
 393 }
 394 static inline bool br_multicast_is_router(struct net_bridge *br)
 395 {
 396         return 0;
 397 }
 398 #endif
 399
 400 /* br_netfilter.c */
 401 #ifdef CONFIG_BRIDGE_NETFILTER
 402 extern int br_netfilter_init(void);
 403 extern void br_netfilter_fini(void);
 404 extern void br_netfilter_rtable_init(struct net_bridge *);
 405 #else
 406 #define br_netfilter_init()     (0)
 407 #define br_netfilter_fini()     do { } while(0)
 408 #define br_netfilter_rtable_init(x)
 409 #endif
 410
 411 /* br_stp.c */
 412 extern void br_log_state(const struct net_bridge_port *p);
 413 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 414                                            u16 port_no);
 415 extern void br_init_port(struct net_bridge_port *p);
 416 extern void br_become_designated_port(struct net_bridge_port *p);
 417
 418 /* br_stp_if.c */
 419 extern void br_stp_enable_bridge(struct net_bridge *br);
 420 extern void br_stp_disable_bridge(struct net_bridge *br);
 421 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 422 extern void br_stp_enable_port(struct net_bridge_port *p);
 423 extern void br_stp_disable_port(struct net_bridge_port *p);
 424 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 425 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 426 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 427                                        u16 newprio);
 428 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 429                                      u8 newprio);
 430 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 431                                  u32 path_cost);
 432 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 433
 434 /* br_stp_bpdu.c */
 435 struct stp_proto;
 436 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 437                        struct net_device *dev);
 438
 439 /* br_stp_timer.c */
 440 extern void br_stp_timer_init(struct net_bridge *br);
 441 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 442 extern unsigned long br_timer_value(const struct timer_list *timer);
 443
 444 /* br.c */
 445 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
 446 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 447 #endif
 448
 449 /* br_netlink.c */
 450 extern int br_netlink_init(void);
 451 extern void br_netlink_fini(void);
 452 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 453
 454 #ifdef CONFIG_SYSFS
 455 /* br_sysfs_if.c */
 456 extern const struct sysfs_ops brport_sysfs_ops;
 457 extern int br_sysfs_addif(struct net_bridge_port *p);
 458
 459 /* br_sysfs_br.c */
 460 extern int br_sysfs_addbr(struct net_device *dev);
 461 extern void br_sysfs_delbr(struct net_device *dev);
 462
 463 #else
 464
 465 #define br_sysfs_addif(p)       (0)
 466 #define br_sysfs_addbr(dev)     (0)
 467 #define br_sysfs_delbr(dev)     do { } while(0)
 468 #endif /* CONFIG_SYSFS */
 469
 470 #endif