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 <linux/netpoll.h> 19 #include <linux/u64_stats_sync.h> 20 #include <net/route.h> 21 22 #define BR_HASH_BITS 8 23 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 24 25 #define BR_HOLD_TIME (1*HZ) 26 27 #define BR_PORT_BITS 10 28 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 29 30 #define BR_VERSION "2.3" 31 32 /* Path to usermode spanning tree program */ 33 #define BR_STP_PROG "/sbin/bridge-stp" 34 35 typedef struct bridge_id bridge_id; 36 typedef struct mac_addr mac_addr; 37 typedef __u16 port_id; 38 39 struct bridge_id 40 { 41 unsigned char prio[2]; 42 unsigned char addr[6]; 43 }; 44 45 struct mac_addr 46 { 47 unsigned char addr[6]; 48 }; 49 50 struct br_ip 51 { 52 union { 53 __be32 ip4; 54 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 55 struct in6_addr ip6; 56 #endif 57 } u; 58 __be16 proto; 59 }; 60 61 struct net_bridge_fdb_entry 62 { 63 struct hlist_node hlist; 64 struct net_bridge_port *dst; 65 66 struct rcu_head rcu; 67 unsigned long ageing_timer; 68 mac_addr addr; 69 unsigned char is_local; 70 unsigned char is_static; 71 }; 72 73 struct net_bridge_port_group { 74 struct net_bridge_port *port; 75 struct net_bridge_port_group __rcu *next; 76 struct hlist_node mglist; 77 struct rcu_head rcu; 78 struct timer_list timer; 79 struct timer_list query_timer; 80 struct br_ip addr; 81 u32 queries_sent; 82 }; 83 84 struct net_bridge_mdb_entry 85 { 86 struct hlist_node hlist[2]; 87 struct net_bridge *br; 88 struct net_bridge_port_group __rcu *ports; 89 struct rcu_head rcu; 90 struct timer_list timer; 91 struct timer_list query_timer; 92 struct br_ip addr; 93 bool mglist; 94 u32 queries_sent; 95 }; 96 97 struct net_bridge_mdb_htable 98 { 99 struct hlist_head *mhash; 100 struct rcu_head rcu; 101 struct net_bridge_mdb_htable *old; 102 u32 size; 103 u32 max; 104 u32 secret; 105 u32 ver; 106 }; 107 108 struct net_bridge_port 109 { 110 struct net_bridge *br; 111 struct net_device *dev; 112 struct list_head list; 113 114 /* STP */ 115 u8 priority; 116 u8 state; 117 u16 port_no; 118 unsigned char topology_change_ack; 119 unsigned char config_pending; 120 port_id port_id; 121 port_id designated_port; 122 bridge_id designated_root; 123 bridge_id designated_bridge; 124 u32 path_cost; 125 u32 designated_cost; 126 127 struct timer_list forward_delay_timer; 128 struct timer_list hold_timer; 129 struct timer_list message_age_timer; 130 struct kobject kobj; 131 struct rcu_head rcu; 132 133 unsigned long flags; 134 #define BR_HAIRPIN_MODE 0x00000001 135 136 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 137 u32 multicast_startup_queries_sent; 138 unsigned char multicast_router; 139 struct timer_list multicast_router_timer; 140 struct timer_list multicast_query_timer; 141 struct hlist_head mglist; 142 struct hlist_node rlist; 143 #endif 144 145 #ifdef CONFIG_SYSFS 146 char sysfs_name[IFNAMSIZ]; 147 #endif 148 149 #ifdef CONFIG_NET_POLL_CONTROLLER 150 struct netpoll *np; 151 #endif 152 }; 153 154 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 155 156 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 157 { 158 struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data); 159 return br_port_exists(dev) ? port : NULL; 160 } 161 162 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev) 163 { 164 return br_port_exists(dev) ? 165 rtnl_dereference(dev->rx_handler_data) : NULL; 166 } 167 168 struct br_cpu_netstats { 169 u64 rx_packets; 170 u64 rx_bytes; 171 u64 tx_packets; 172 u64 tx_bytes; 173 struct u64_stats_sync syncp; 174 }; 175 176 struct net_bridge 177 { 178 spinlock_t lock; 179 struct list_head port_list; 180 struct net_device *dev; 181 182 struct br_cpu_netstats __percpu *stats; 183 spinlock_t hash_lock; 184 struct hlist_head hash[BR_HASH_SIZE]; 185 u32 feature_mask; 186 #ifdef CONFIG_BRIDGE_NETFILTER 187 struct rtable fake_rtable; 188 bool nf_call_iptables; 189 bool nf_call_ip6tables; 190 bool nf_call_arptables; 191 #endif 192 unsigned long flags; 193 #define BR_SET_MAC_ADDR 0x00000001 194 195 /* STP */ 196 bridge_id designated_root; 197 bridge_id bridge_id; 198 u32 root_path_cost; 199 unsigned long max_age; 200 unsigned long hello_time; 201 unsigned long forward_delay; 202 unsigned long bridge_max_age; 203 unsigned long ageing_time; 204 unsigned long bridge_hello_time; 205 unsigned long bridge_forward_delay; 206 207 u8 group_addr[ETH_ALEN]; 208 u16 root_port; 209 210 enum { 211 BR_NO_STP, /* no spanning tree */ 212 BR_KERNEL_STP, /* old STP in kernel */ 213 BR_USER_STP, /* new RSTP in userspace */ 214 } stp_enabled; 215 216 unsigned char topology_change; 217 unsigned char topology_change_detected; 218 219 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 220 unsigned char multicast_router; 221 222 u8 multicast_disabled:1; 223 224 u32 hash_elasticity; 225 u32 hash_max; 226 227 u32 multicast_last_member_count; 228 u32 multicast_startup_queries_sent; 229 u32 multicast_startup_query_count; 230 231 unsigned long multicast_last_member_interval; 232 unsigned long multicast_membership_interval; 233 unsigned long multicast_querier_interval; 234 unsigned long multicast_query_interval; 235 unsigned long multicast_query_response_interval; 236 unsigned long multicast_startup_query_interval; 237 238 spinlock_t multicast_lock; 239 struct net_bridge_mdb_htable __rcu *mdb; 240 struct hlist_head router_list; 241 242 struct timer_list multicast_router_timer; 243 struct timer_list multicast_querier_timer; 244 struct timer_list multicast_query_timer; 245 #endif 246 247 struct timer_list hello_timer; 248 struct timer_list tcn_timer; 249 struct timer_list topology_change_timer; 250 struct timer_list gc_timer; 251 struct kobject *ifobj; 252 }; 253 254 struct br_input_skb_cb { 255 struct net_device *brdev; 256 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 257 int igmp; 258 int mrouters_only; 259 #endif 260 }; 261 262 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 263 264 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 265 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 266 #else 267 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 268 #endif 269 270 #define br_printk(level, br, format, args...) \ 271 printk(level "%s: " format, (br)->dev->name, ##args) 272 273 #define br_err(__br, format, args...) \ 274 br_printk(KERN_ERR, __br, format, ##args) 275 #define br_warn(__br, format, args...) \ 276 br_printk(KERN_WARNING, __br, format, ##args) 277 #define br_notice(__br, format, args...) \ 278 br_printk(KERN_NOTICE, __br, format, ##args) 279 #define br_info(__br, format, args...) \ 280 br_printk(KERN_INFO, __br, format, ##args) 281 282 #define br_debug(br, format, args...) \ 283 pr_debug("%s: " format, (br)->dev->name, ##args) 284 285 extern struct notifier_block br_device_notifier; 286 extern const u8 br_group_address[ETH_ALEN]; 287 288 /* called under bridge lock */ 289 static inline int br_is_root_bridge(const struct net_bridge *br) 290 { 291 return !memcmp(&br->bridge_id, &br->designated_root, 8); 292 } 293 294 /* br_device.c */ 295 extern void br_dev_setup(struct net_device *dev); 296 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb, 297 struct net_device *dev); 298 #ifdef CONFIG_NET_POLL_CONTROLLER 299 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) 300 { 301 return br->dev->npinfo; 302 } 303 304 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 305 struct sk_buff *skb) 306 { 307 struct netpoll *np = p->np; 308 309 if (np) 310 netpoll_send_skb(np, skb); 311 } 312 313 extern int br_netpoll_enable(struct net_bridge_port *p); 314 extern void br_netpoll_disable(struct net_bridge_port *p); 315 #else 316 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) 317 { 318 return NULL; 319 } 320 321 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 322 struct sk_buff *skb) 323 { 324 } 325 326 static inline int br_netpoll_enable(struct net_bridge_port *p) 327 { 328 return 0; 329 } 330 331 static inline void br_netpoll_disable(struct net_bridge_port *p) 332 { 333 } 334 #endif 335 336 /* br_fdb.c */ 337 extern int br_fdb_init(void); 338 extern void br_fdb_fini(void); 339 extern void br_fdb_flush(struct net_bridge *br); 340 extern void br_fdb_changeaddr(struct net_bridge_port *p, 341 const unsigned char *newaddr); 342 extern void br_fdb_cleanup(unsigned long arg); 343 extern void br_fdb_delete_by_port(struct net_bridge *br, 344 const struct net_bridge_port *p, int do_all); 345 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, 346 const unsigned char *addr); 347 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 348 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf, 349 unsigned long count, unsigned long off); 350 extern int br_fdb_insert(struct net_bridge *br, 351 struct net_bridge_port *source, 352 const unsigned char *addr); 353 extern void br_fdb_update(struct net_bridge *br, 354 struct net_bridge_port *source, 355 const unsigned char *addr); 356 357 /* br_forward.c */ 358 extern void br_deliver(const struct net_bridge_port *to, 359 struct sk_buff *skb); 360 extern int br_dev_queue_push_xmit(struct sk_buff *skb); 361 extern void br_forward(const struct net_bridge_port *to, 362 struct sk_buff *skb, struct sk_buff *skb0); 363 extern int br_forward_finish(struct sk_buff *skb); 364 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb); 365 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, 366 struct sk_buff *skb2); 367 368 /* br_if.c */ 369 extern void br_port_carrier_check(struct net_bridge_port *p); 370 extern int br_add_bridge(struct net *net, const char *name); 371 extern int br_del_bridge(struct net *net, const char *name); 372 extern void br_net_exit(struct net *net); 373 extern int br_add_if(struct net_bridge *br, 374 struct net_device *dev); 375 extern int br_del_if(struct net_bridge *br, 376 struct net_device *dev); 377 extern int br_min_mtu(const struct net_bridge *br); 378 extern void br_features_recompute(struct net_bridge *br); 379 380 /* br_input.c */ 381 extern int br_handle_frame_finish(struct sk_buff *skb); 382 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 383 384 /* br_ioctl.c */ 385 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 386 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg); 387 388 /* br_multicast.c */ 389 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 390 extern int br_multicast_rcv(struct net_bridge *br, 391 struct net_bridge_port *port, 392 struct sk_buff *skb); 393 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 394 struct sk_buff *skb); 395 extern void br_multicast_add_port(struct net_bridge_port *port); 396 extern void br_multicast_del_port(struct net_bridge_port *port); 397 extern void br_multicast_enable_port(struct net_bridge_port *port); 398 extern void br_multicast_disable_port(struct net_bridge_port *port); 399 extern void br_multicast_init(struct net_bridge *br); 400 extern void br_multicast_open(struct net_bridge *br); 401 extern void br_multicast_stop(struct net_bridge *br); 402 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 403 struct sk_buff *skb); 404 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 405 struct sk_buff *skb, struct sk_buff *skb2); 406 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val); 407 extern int br_multicast_set_port_router(struct net_bridge_port *p, 408 unsigned long val); 409 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val); 410 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 411 412 static inline bool br_multicast_is_router(struct net_bridge *br) 413 { 414 return br->multicast_router == 2 || 415 (br->multicast_router == 1 && 416 timer_pending(&br->multicast_router_timer)); 417 } 418 #else 419 static inline int br_multicast_rcv(struct net_bridge *br, 420 struct net_bridge_port *port, 421 struct sk_buff *skb) 422 { 423 return 0; 424 } 425 426 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 427 struct sk_buff *skb) 428 { 429 return NULL; 430 } 431 432 static inline void br_multicast_add_port(struct net_bridge_port *port) 433 { 434 } 435 436 static inline void br_multicast_del_port(struct net_bridge_port *port) 437 { 438 } 439 440 static inline void br_multicast_enable_port(struct net_bridge_port *port) 441 { 442 } 443 444 static inline void br_multicast_disable_port(struct net_bridge_port *port) 445 { 446 } 447 448 static inline void br_multicast_init(struct net_bridge *br) 449 { 450 } 451 452 static inline void br_multicast_open(struct net_bridge *br) 453 { 454 } 455 456 static inline void br_multicast_stop(struct net_bridge *br) 457 { 458 } 459 460 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 461 struct sk_buff *skb) 462 { 463 } 464 465 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 466 struct sk_buff *skb, 467 struct sk_buff *skb2) 468 { 469 } 470 static inline bool br_multicast_is_router(struct net_bridge *br) 471 { 472 return 0; 473 } 474 #endif 475 476 /* br_netfilter.c */ 477 #ifdef CONFIG_BRIDGE_NETFILTER 478 extern int br_netfilter_init(void); 479 extern void br_netfilter_fini(void); 480 extern void br_netfilter_rtable_init(struct net_bridge *); 481 #else 482 #define br_netfilter_init() (0) 483 #define br_netfilter_fini() do { } while(0) 484 #define br_netfilter_rtable_init(x) 485 #endif 486 487 /* br_stp.c */ 488 extern void br_log_state(const struct net_bridge_port *p); 489 extern struct net_bridge_port *br_get_port(struct net_bridge *br, 490 u16 port_no); 491 extern void br_init_port(struct net_bridge_port *p); 492 extern void br_become_designated_port(struct net_bridge_port *p); 493 494 /* br_stp_if.c */ 495 extern void br_stp_enable_bridge(struct net_bridge *br); 496 extern void br_stp_disable_bridge(struct net_bridge *br); 497 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 498 extern void br_stp_enable_port(struct net_bridge_port *p); 499 extern void br_stp_disable_port(struct net_bridge_port *p); 500 extern void br_stp_recalculate_bridge_id(struct net_bridge *br); 501 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 502 extern void br_stp_set_bridge_priority(struct net_bridge *br, 503 u16 newprio); 504 extern void br_stp_set_port_priority(struct net_bridge_port *p, 505 u8 newprio); 506 extern void br_stp_set_path_cost(struct net_bridge_port *p, 507 u32 path_cost); 508 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 509 510 /* br_stp_bpdu.c */ 511 struct stp_proto; 512 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 513 struct net_device *dev); 514 515 /* br_stp_timer.c */ 516 extern void br_stp_timer_init(struct net_bridge *br); 517 extern void br_stp_port_timer_init(struct net_bridge_port *p); 518 extern unsigned long br_timer_value(const struct timer_list *timer); 519 520 /* br.c */ 521 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) 522 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 523 #endif 524 525 /* br_netlink.c */ 526 extern int br_netlink_init(void); 527 extern void br_netlink_fini(void); 528 extern void br_ifinfo_notify(int event, struct net_bridge_port *port); 529 530 #ifdef CONFIG_SYSFS 531 /* br_sysfs_if.c */ 532 extern const struct sysfs_ops brport_sysfs_ops; 533 extern int br_sysfs_addif(struct net_bridge_port *p); 534 extern int br_sysfs_renameif(struct net_bridge_port *p); 535 536 /* br_sysfs_br.c */ 537 extern int br_sysfs_addbr(struct net_device *dev); 538 extern void br_sysfs_delbr(struct net_device *dev); 539 540 #else 541 542 #define br_sysfs_addif(p) (0) 543 #define br_sysfs_renameif(p) (0) 544 #define br_sysfs_addbr(dev) (0) 545 #define br_sysfs_delbr(dev) do { } while(0) 546 #endif /* CONFIG_SYSFS */ 547 548 #endif 549