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 #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 extern int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb); 357 extern int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); 358 extern int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); 359 360 /* br_forward.c */ 361 extern void br_deliver(const struct net_bridge_port *to, 362 struct sk_buff *skb); 363 extern int br_dev_queue_push_xmit(struct sk_buff *skb); 364 extern void br_forward(const struct net_bridge_port *to, 365 struct sk_buff *skb, struct sk_buff *skb0); 366 extern int br_forward_finish(struct sk_buff *skb); 367 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb); 368 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, 369 struct sk_buff *skb2); 370 371 /* br_if.c */ 372 extern void br_port_carrier_check(struct net_bridge_port *p); 373 extern int br_add_bridge(struct net *net, const char *name); 374 extern int br_del_bridge(struct net *net, const char *name); 375 extern void br_net_exit(struct net *net); 376 extern int br_add_if(struct net_bridge *br, 377 struct net_device *dev); 378 extern int br_del_if(struct net_bridge *br, 379 struct net_device *dev); 380 extern int br_min_mtu(const struct net_bridge *br); 381 extern u32 br_features_recompute(struct net_bridge *br, u32 features); 382 383 /* br_input.c */ 384 extern int br_handle_frame_finish(struct sk_buff *skb); 385 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 386 387 /* br_ioctl.c */ 388 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 389 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg); 390 391 /* br_multicast.c */ 392 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 393 extern int br_multicast_rcv(struct net_bridge *br, 394 struct net_bridge_port *port, 395 struct sk_buff *skb); 396 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 397 struct sk_buff *skb); 398 extern void br_multicast_add_port(struct net_bridge_port *port); 399 extern void br_multicast_del_port(struct net_bridge_port *port); 400 extern void br_multicast_enable_port(struct net_bridge_port *port); 401 extern void br_multicast_disable_port(struct net_bridge_port *port); 402 extern void br_multicast_init(struct net_bridge *br); 403 extern void br_multicast_open(struct net_bridge *br); 404 extern void br_multicast_stop(struct net_bridge *br); 405 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 406 struct sk_buff *skb); 407 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 408 struct sk_buff *skb, struct sk_buff *skb2); 409 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val); 410 extern int br_multicast_set_port_router(struct net_bridge_port *p, 411 unsigned long val); 412 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val); 413 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 414 415 static inline bool br_multicast_is_router(struct net_bridge *br) 416 { 417 return br->multicast_router == 2 || 418 (br->multicast_router == 1 && 419 timer_pending(&br->multicast_router_timer)); 420 } 421 #else 422 static inline int br_multicast_rcv(struct net_bridge *br, 423 struct net_bridge_port *port, 424 struct sk_buff *skb) 425 { 426 return 0; 427 } 428 429 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 430 struct sk_buff *skb) 431 { 432 return NULL; 433 } 434 435 static inline void br_multicast_add_port(struct net_bridge_port *port) 436 { 437 } 438 439 static inline void br_multicast_del_port(struct net_bridge_port *port) 440 { 441 } 442 443 static inline void br_multicast_enable_port(struct net_bridge_port *port) 444 { 445 } 446 447 static inline void br_multicast_disable_port(struct net_bridge_port *port) 448 { 449 } 450 451 static inline void br_multicast_init(struct net_bridge *br) 452 { 453 } 454 455 static inline void br_multicast_open(struct net_bridge *br) 456 { 457 } 458 459 static inline void br_multicast_stop(struct net_bridge *br) 460 { 461 } 462 463 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 464 struct sk_buff *skb) 465 { 466 } 467 468 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 469 struct sk_buff *skb, 470 struct sk_buff *skb2) 471 { 472 } 473 static inline bool br_multicast_is_router(struct net_bridge *br) 474 { 475 return 0; 476 } 477 #endif 478 479 /* br_netfilter.c */ 480 #ifdef CONFIG_BRIDGE_NETFILTER 481 extern int br_netfilter_init(void); 482 extern void br_netfilter_fini(void); 483 extern void br_netfilter_rtable_init(struct net_bridge *); 484 #else 485 #define br_netfilter_init() (0) 486 #define br_netfilter_fini() do { } while(0) 487 #define br_netfilter_rtable_init(x) 488 #endif 489 490 /* br_stp.c */ 491 extern void br_log_state(const struct net_bridge_port *p); 492 extern struct net_bridge_port *br_get_port(struct net_bridge *br, 493 u16 port_no); 494 extern void br_init_port(struct net_bridge_port *p); 495 extern void br_become_designated_port(struct net_bridge_port *p); 496 497 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x); 498 extern int br_set_hello_time(struct net_bridge *br, unsigned long x); 499 extern int br_set_max_age(struct net_bridge *br, unsigned long x); 500 501 502 /* br_stp_if.c */ 503 extern void br_stp_enable_bridge(struct net_bridge *br); 504 extern void br_stp_disable_bridge(struct net_bridge *br); 505 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 506 extern void br_stp_enable_port(struct net_bridge_port *p); 507 extern void br_stp_disable_port(struct net_bridge_port *p); 508 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br); 509 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 510 extern void br_stp_set_bridge_priority(struct net_bridge *br, 511 u16 newprio); 512 extern int br_stp_set_port_priority(struct net_bridge_port *p, 513 unsigned long newprio); 514 extern int br_stp_set_path_cost(struct net_bridge_port *p, 515 unsigned long path_cost); 516 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 517 518 /* br_stp_bpdu.c */ 519 struct stp_proto; 520 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 521 struct net_device *dev); 522 523 /* br_stp_timer.c */ 524 extern void br_stp_timer_init(struct net_bridge *br); 525 extern void br_stp_port_timer_init(struct net_bridge_port *p); 526 extern unsigned long br_timer_value(const struct timer_list *timer); 527 528 /* br.c */ 529 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) 530 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 531 #endif 532 533 /* br_netlink.c */ 534 extern int br_netlink_init(void); 535 extern void br_netlink_fini(void); 536 extern void br_ifinfo_notify(int event, struct net_bridge_port *port); 537 538 #ifdef CONFIG_SYSFS 539 /* br_sysfs_if.c */ 540 extern const struct sysfs_ops brport_sysfs_ops; 541 extern int br_sysfs_addif(struct net_bridge_port *p); 542 extern int br_sysfs_renameif(struct net_bridge_port *p); 543 544 /* br_sysfs_br.c */ 545 extern int br_sysfs_addbr(struct net_device *dev); 546 extern void br_sysfs_delbr(struct net_device *dev); 547 548 #else 549 550 #define br_sysfs_addif(p) (0) 551 #define br_sysfs_renameif(p) (0) 552 #define br_sysfs_addbr(dev) (0) 553 #define br_sysfs_delbr(dev) do { } while(0) 554 #endif /* CONFIG_SYSFS */ 555 556 #endif 557