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 updated; 68 unsigned long used; 69 mac_addr addr; 70 unsigned char is_local; 71 unsigned char is_static; 72 }; 73 74 struct net_bridge_port_group { 75 struct net_bridge_port *port; 76 struct net_bridge_port_group __rcu *next; 77 struct hlist_node mglist; 78 struct rcu_head rcu; 79 struct timer_list timer; 80 struct timer_list query_timer; 81 struct br_ip addr; 82 u32 queries_sent; 83 }; 84 85 struct net_bridge_mdb_entry 86 { 87 struct hlist_node hlist[2]; 88 struct net_bridge *br; 89 struct net_bridge_port_group __rcu *ports; 90 struct rcu_head rcu; 91 struct timer_list timer; 92 struct timer_list query_timer; 93 struct br_ip addr; 94 bool mglist; 95 u32 queries_sent; 96 }; 97 98 struct net_bridge_mdb_htable 99 { 100 struct hlist_head *mhash; 101 struct rcu_head rcu; 102 struct net_bridge_mdb_htable *old; 103 u32 size; 104 u32 max; 105 u32 secret; 106 u32 ver; 107 }; 108 109 struct net_bridge_port 110 { 111 struct net_bridge *br; 112 struct net_device *dev; 113 struct list_head list; 114 115 /* STP */ 116 u8 priority; 117 u8 state; 118 u16 port_no; 119 unsigned char topology_change_ack; 120 unsigned char config_pending; 121 port_id port_id; 122 port_id designated_port; 123 bridge_id designated_root; 124 bridge_id designated_bridge; 125 u32 path_cost; 126 u32 designated_cost; 127 128 struct timer_list forward_delay_timer; 129 struct timer_list hold_timer; 130 struct timer_list message_age_timer; 131 struct kobject kobj; 132 struct rcu_head rcu; 133 134 unsigned long flags; 135 #define BR_HAIRPIN_MODE 0x00000001 136 137 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 138 u32 multicast_startup_queries_sent; 139 unsigned char multicast_router; 140 struct timer_list multicast_router_timer; 141 struct timer_list multicast_query_timer; 142 struct hlist_head mglist; 143 struct hlist_node rlist; 144 #endif 145 146 #ifdef CONFIG_SYSFS 147 char sysfs_name[IFNAMSIZ]; 148 #endif 149 150 #ifdef CONFIG_NET_POLL_CONTROLLER 151 struct netpoll *np; 152 #endif 153 }; 154 155 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 156 157 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 158 { 159 struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data); 160 return br_port_exists(dev) ? port : NULL; 161 } 162 163 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev) 164 { 165 return br_port_exists(dev) ? 166 rtnl_dereference(dev->rx_handler_data) : NULL; 167 } 168 169 struct br_cpu_netstats { 170 u64 rx_packets; 171 u64 rx_bytes; 172 u64 tx_packets; 173 u64 tx_bytes; 174 struct u64_stats_sync syncp; 175 }; 176 177 struct net_bridge 178 { 179 spinlock_t lock; 180 struct list_head port_list; 181 struct net_device *dev; 182 183 struct br_cpu_netstats __percpu *stats; 184 spinlock_t hash_lock; 185 struct hlist_head hash[BR_HASH_SIZE]; 186 u32 feature_mask; 187 #ifdef CONFIG_BRIDGE_NETFILTER 188 struct rtable fake_rtable; 189 bool nf_call_iptables; 190 bool nf_call_ip6tables; 191 bool nf_call_arptables; 192 #endif 193 unsigned long flags; 194 #define BR_SET_MAC_ADDR 0x00000001 195 196 /* STP */ 197 bridge_id designated_root; 198 bridge_id bridge_id; 199 u32 root_path_cost; 200 unsigned long max_age; 201 unsigned long hello_time; 202 unsigned long forward_delay; 203 unsigned long bridge_max_age; 204 unsigned long ageing_time; 205 unsigned long bridge_hello_time; 206 unsigned long bridge_forward_delay; 207 208 u8 group_addr[ETH_ALEN]; 209 u16 root_port; 210 211 enum { 212 BR_NO_STP, /* no spanning tree */ 213 BR_KERNEL_STP, /* old STP in kernel */ 214 BR_USER_STP, /* new RSTP in userspace */ 215 } stp_enabled; 216 217 unsigned char topology_change; 218 unsigned char topology_change_detected; 219 220 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 221 unsigned char multicast_router; 222 223 u8 multicast_disabled:1; 224 225 u32 hash_elasticity; 226 u32 hash_max; 227 228 u32 multicast_last_member_count; 229 u32 multicast_startup_queries_sent; 230 u32 multicast_startup_query_count; 231 232 unsigned long multicast_last_member_interval; 233 unsigned long multicast_membership_interval; 234 unsigned long multicast_querier_interval; 235 unsigned long multicast_query_interval; 236 unsigned long multicast_query_response_interval; 237 unsigned long multicast_startup_query_interval; 238 239 spinlock_t multicast_lock; 240 struct net_bridge_mdb_htable __rcu *mdb; 241 struct hlist_head router_list; 242 243 struct timer_list multicast_router_timer; 244 struct timer_list multicast_querier_timer; 245 struct timer_list multicast_query_timer; 246 #endif 247 248 struct timer_list hello_timer; 249 struct timer_list tcn_timer; 250 struct timer_list topology_change_timer; 251 struct timer_list gc_timer; 252 struct kobject *ifobj; 253 }; 254 255 struct br_input_skb_cb { 256 struct net_device *brdev; 257 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 258 int igmp; 259 int mrouters_only; 260 #endif 261 }; 262 263 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 264 265 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 266 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 267 #else 268 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 269 #endif 270 271 #define br_printk(level, br, format, args...) \ 272 printk(level "%s: " format, (br)->dev->name, ##args) 273 274 #define br_err(__br, format, args...) \ 275 br_printk(KERN_ERR, __br, format, ##args) 276 #define br_warn(__br, format, args...) \ 277 br_printk(KERN_WARNING, __br, format, ##args) 278 #define br_notice(__br, format, args...) \ 279 br_printk(KERN_NOTICE, __br, format, ##args) 280 #define br_info(__br, format, args...) \ 281 br_printk(KERN_INFO, __br, format, ##args) 282 283 #define br_debug(br, format, args...) \ 284 pr_debug("%s: " format, (br)->dev->name, ##args) 285 286 extern struct notifier_block br_device_notifier; 287 extern const u8 br_group_address[ETH_ALEN]; 288 289 /* called under bridge lock */ 290 static inline int br_is_root_bridge(const struct net_bridge *br) 291 { 292 return !memcmp(&br->bridge_id, &br->designated_root, 8); 293 } 294 295 /* br_device.c */ 296 extern void br_dev_setup(struct net_device *dev); 297 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb, 298 struct net_device *dev); 299 #ifdef CONFIG_NET_POLL_CONTROLLER 300 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) 301 { 302 return br->dev->npinfo; 303 } 304 305 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 306 struct sk_buff *skb) 307 { 308 struct netpoll *np = p->np; 309 310 if (np) 311 netpoll_send_skb(np, skb); 312 } 313 314 extern int br_netpoll_enable(struct net_bridge_port *p); 315 extern void br_netpoll_disable(struct net_bridge_port *p); 316 #else 317 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) 318 { 319 return NULL; 320 } 321 322 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 323 struct sk_buff *skb) 324 { 325 } 326 327 static inline int br_netpoll_enable(struct net_bridge_port *p) 328 { 329 return 0; 330 } 331 332 static inline void br_netpoll_disable(struct net_bridge_port *p) 333 { 334 } 335 #endif 336 337 /* br_fdb.c */ 338 extern int br_fdb_init(void); 339 extern void br_fdb_fini(void); 340 extern void br_fdb_flush(struct net_bridge *br); 341 extern void br_fdb_changeaddr(struct net_bridge_port *p, 342 const unsigned char *newaddr); 343 extern void br_fdb_cleanup(unsigned long arg); 344 extern void br_fdb_delete_by_port(struct net_bridge *br, 345 const struct net_bridge_port *p, int do_all); 346 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, 347 const unsigned char *addr); 348 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 349 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf, 350 unsigned long count, unsigned long off); 351 extern int br_fdb_insert(struct net_bridge *br, 352 struct net_bridge_port *source, 353 const unsigned char *addr); 354 extern void br_fdb_update(struct net_bridge *br, 355 struct net_bridge_port *source, 356 const unsigned char *addr); 357 358 /* br_forward.c */ 359 extern void br_deliver(const struct net_bridge_port *to, 360 struct sk_buff *skb); 361 extern int br_dev_queue_push_xmit(struct sk_buff *skb); 362 extern void br_forward(const struct net_bridge_port *to, 363 struct sk_buff *skb, struct sk_buff *skb0); 364 extern int br_forward_finish(struct sk_buff *skb); 365 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb); 366 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, 367 struct sk_buff *skb2); 368 369 /* br_if.c */ 370 extern void br_port_carrier_check(struct net_bridge_port *p); 371 extern int br_add_bridge(struct net *net, const char *name); 372 extern int br_del_bridge(struct net *net, const char *name); 373 extern void br_net_exit(struct net *net); 374 extern int br_add_if(struct net_bridge *br, 375 struct net_device *dev); 376 extern int br_del_if(struct net_bridge *br, 377 struct net_device *dev); 378 extern int br_min_mtu(const struct net_bridge *br); 379 extern void br_features_recompute(struct net_bridge *br); 380 381 /* br_input.c */ 382 extern int br_handle_frame_finish(struct sk_buff *skb); 383 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 384 385 /* br_ioctl.c */ 386 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 387 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg); 388 389 /* br_multicast.c */ 390 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 391 extern int br_multicast_rcv(struct net_bridge *br, 392 struct net_bridge_port *port, 393 struct sk_buff *skb); 394 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 395 struct sk_buff *skb); 396 extern void br_multicast_add_port(struct net_bridge_port *port); 397 extern void br_multicast_del_port(struct net_bridge_port *port); 398 extern void br_multicast_enable_port(struct net_bridge_port *port); 399 extern void br_multicast_disable_port(struct net_bridge_port *port); 400 extern void br_multicast_init(struct net_bridge *br); 401 extern void br_multicast_open(struct net_bridge *br); 402 extern void br_multicast_stop(struct net_bridge *br); 403 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 404 struct sk_buff *skb); 405 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 406 struct sk_buff *skb, struct sk_buff *skb2); 407 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val); 408 extern int br_multicast_set_port_router(struct net_bridge_port *p, 409 unsigned long val); 410 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val); 411 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 412 413 static inline bool br_multicast_is_router(struct net_bridge *br) 414 { 415 return br->multicast_router == 2 || 416 (br->multicast_router == 1 && 417 timer_pending(&br->multicast_router_timer)); 418 } 419 #else 420 static inline int br_multicast_rcv(struct net_bridge *br, 421 struct net_bridge_port *port, 422 struct sk_buff *skb) 423 { 424 return 0; 425 } 426 427 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 428 struct sk_buff *skb) 429 { 430 return NULL; 431 } 432 433 static inline void br_multicast_add_port(struct net_bridge_port *port) 434 { 435 } 436 437 static inline void br_multicast_del_port(struct net_bridge_port *port) 438 { 439 } 440 441 static inline void br_multicast_enable_port(struct net_bridge_port *port) 442 { 443 } 444 445 static inline void br_multicast_disable_port(struct net_bridge_port *port) 446 { 447 } 448 449 static inline void br_multicast_init(struct net_bridge *br) 450 { 451 } 452 453 static inline void br_multicast_open(struct net_bridge *br) 454 { 455 } 456 457 static inline void br_multicast_stop(struct net_bridge *br) 458 { 459 } 460 461 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 462 struct sk_buff *skb) 463 { 464 } 465 466 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 467 struct sk_buff *skb, 468 struct sk_buff *skb2) 469 { 470 } 471 static inline bool br_multicast_is_router(struct net_bridge *br) 472 { 473 return 0; 474 } 475 #endif 476 477 /* br_netfilter.c */ 478 #ifdef CONFIG_BRIDGE_NETFILTER 479 extern int br_netfilter_init(void); 480 extern void br_netfilter_fini(void); 481 extern void br_netfilter_rtable_init(struct net_bridge *); 482 #else 483 #define br_netfilter_init() (0) 484 #define br_netfilter_fini() do { } while(0) 485 #define br_netfilter_rtable_init(x) 486 #endif 487 488 /* br_stp.c */ 489 extern void br_log_state(const struct net_bridge_port *p); 490 extern struct net_bridge_port *br_get_port(struct net_bridge *br, 491 u16 port_no); 492 extern void br_init_port(struct net_bridge_port *p); 493 extern void br_become_designated_port(struct net_bridge_port *p); 494 495 /* br_stp_if.c */ 496 extern void br_stp_enable_bridge(struct net_bridge *br); 497 extern void br_stp_disable_bridge(struct net_bridge *br); 498 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 499 extern void br_stp_enable_port(struct net_bridge_port *p); 500 extern void br_stp_disable_port(struct net_bridge_port *p); 501 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br); 502 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 503 extern void br_stp_set_bridge_priority(struct net_bridge *br, 504 u16 newprio); 505 extern void br_stp_set_port_priority(struct net_bridge_port *p, 506 u8 newprio); 507 extern void br_stp_set_path_cost(struct net_bridge_port *p, 508 u32 path_cost); 509 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 510 511 /* br_stp_bpdu.c */ 512 struct stp_proto; 513 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 514 struct net_device *dev); 515 516 /* br_stp_timer.c */ 517 extern void br_stp_timer_init(struct net_bridge *br); 518 extern void br_stp_port_timer_init(struct net_bridge_port *p); 519 extern unsigned long br_timer_value(const struct timer_list *timer); 520 521 /* br.c */ 522 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) 523 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 524 #endif 525 526 /* br_netlink.c */ 527 extern int br_netlink_init(void); 528 extern void br_netlink_fini(void); 529 extern void br_ifinfo_notify(int event, struct net_bridge_port *port); 530 531 #ifdef CONFIG_SYSFS 532 /* br_sysfs_if.c */ 533 extern const struct sysfs_ops brport_sysfs_ops; 534 extern int br_sysfs_addif(struct net_bridge_port *p); 535 extern int br_sysfs_renameif(struct net_bridge_port *p); 536 537 /* br_sysfs_br.c */ 538 extern int br_sysfs_addbr(struct net_device *dev); 539 extern void br_sysfs_delbr(struct net_device *dev); 540 541 #else 542 543 #define br_sysfs_addif(p) (0) 544 #define br_sysfs_renameif(p) (0) 545 #define br_sysfs_addbr(dev) (0) 546 #define br_sysfs_delbr(dev) do { } while(0) 547 #endif /* CONFIG_SYSFS */ 548 549 #endif 550