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 /* Control of forwarding link local multicast */ 33 #define BR_GROUPFWD_DEFAULT 0 34 /* Don't allow forwarding control protocols like STP and LLDP */ 35 #define BR_GROUPFWD_RESTRICTED 0x4007u 36 37 /* Path to usermode spanning tree program */ 38 #define BR_STP_PROG "/sbin/bridge-stp" 39 40 typedef struct bridge_id bridge_id; 41 typedef struct mac_addr mac_addr; 42 typedef __u16 port_id; 43 44 struct bridge_id 45 { 46 unsigned char prio[2]; 47 unsigned char addr[6]; 48 }; 49 50 struct mac_addr 51 { 52 unsigned char addr[6]; 53 }; 54 55 struct br_ip 56 { 57 union { 58 __be32 ip4; 59 #if IS_ENABLED(CONFIG_IPV6) 60 struct in6_addr ip6; 61 #endif 62 } u; 63 __be16 proto; 64 }; 65 66 struct net_bridge_fdb_entry 67 { 68 struct hlist_node hlist; 69 struct net_bridge_port *dst; 70 71 struct rcu_head rcu; 72 unsigned long updated; 73 unsigned long used; 74 mac_addr addr; 75 unsigned char is_local; 76 unsigned char is_static; 77 }; 78 79 struct net_bridge_port_group { 80 struct net_bridge_port *port; 81 struct net_bridge_port_group __rcu *next; 82 struct hlist_node mglist; 83 struct rcu_head rcu; 84 struct timer_list timer; 85 struct br_ip addr; 86 }; 87 88 struct net_bridge_mdb_entry 89 { 90 struct hlist_node hlist[2]; 91 struct net_bridge *br; 92 struct net_bridge_port_group __rcu *ports; 93 struct rcu_head rcu; 94 struct timer_list timer; 95 struct br_ip addr; 96 bool mglist; 97 }; 98 99 struct net_bridge_mdb_htable 100 { 101 struct hlist_head *mhash; 102 struct rcu_head rcu; 103 struct net_bridge_mdb_htable *old; 104 u32 size; 105 u32 max; 106 u32 secret; 107 u32 ver; 108 }; 109 110 struct net_bridge_port 111 { 112 struct net_bridge *br; 113 struct net_device *dev; 114 struct list_head list; 115 116 /* STP */ 117 u8 priority; 118 u8 state; 119 u16 port_no; 120 unsigned char topology_change_ack; 121 unsigned char config_pending; 122 port_id port_id; 123 port_id designated_port; 124 bridge_id designated_root; 125 bridge_id designated_bridge; 126 u32 path_cost; 127 u32 designated_cost; 128 unsigned long designated_age; 129 130 struct timer_list forward_delay_timer; 131 struct timer_list hold_timer; 132 struct timer_list message_age_timer; 133 struct kobject kobj; 134 struct rcu_head rcu; 135 136 unsigned long flags; 137 #define BR_HAIRPIN_MODE 0x00000001 138 139 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 140 u32 multicast_startup_queries_sent; 141 unsigned char multicast_router; 142 struct timer_list multicast_router_timer; 143 struct timer_list multicast_query_timer; 144 struct hlist_head mglist; 145 struct hlist_node rlist; 146 #endif 147 148 #ifdef CONFIG_SYSFS 149 char sysfs_name[IFNAMSIZ]; 150 #endif 151 152 #ifdef CONFIG_NET_POLL_CONTROLLER 153 struct netpoll *np; 154 #endif 155 }; 156 157 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 158 159 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 160 { 161 struct net_bridge_port *port = 162 rcu_dereference_rtnl(dev->rx_handler_data); 163 164 return br_port_exists(dev) ? port : NULL; 165 } 166 167 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev) 168 { 169 return br_port_exists(dev) ? 170 rtnl_dereference(dev->rx_handler_data) : NULL; 171 } 172 173 struct br_cpu_netstats { 174 u64 rx_packets; 175 u64 rx_bytes; 176 u64 tx_packets; 177 u64 tx_bytes; 178 struct u64_stats_sync syncp; 179 }; 180 181 struct net_bridge 182 { 183 spinlock_t lock; 184 struct list_head port_list; 185 struct net_device *dev; 186 187 struct br_cpu_netstats __percpu *stats; 188 spinlock_t hash_lock; 189 struct hlist_head hash[BR_HASH_SIZE]; 190 #ifdef CONFIG_BRIDGE_NETFILTER 191 struct rtable fake_rtable; 192 bool nf_call_iptables; 193 bool nf_call_ip6tables; 194 bool nf_call_arptables; 195 #endif 196 unsigned long flags; 197 #define BR_SET_MAC_ADDR 0x00000001 198 199 u16 group_fwd_mask; 200 201 /* STP */ 202 bridge_id designated_root; 203 bridge_id bridge_id; 204 u32 root_path_cost; 205 unsigned long max_age; 206 unsigned long hello_time; 207 unsigned long forward_delay; 208 unsigned long bridge_max_age; 209 unsigned long ageing_time; 210 unsigned long bridge_hello_time; 211 unsigned long bridge_forward_delay; 212 213 u8 group_addr[ETH_ALEN]; 214 u16 root_port; 215 216 enum { 217 BR_NO_STP, /* no spanning tree */ 218 BR_KERNEL_STP, /* old STP in kernel */ 219 BR_USER_STP, /* new RSTP in userspace */ 220 } stp_enabled; 221 222 unsigned char topology_change; 223 unsigned char topology_change_detected; 224 225 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 226 unsigned char multicast_router; 227 228 u8 multicast_disabled:1; 229 u8 multicast_querier:1; 230 231 u32 hash_elasticity; 232 u32 hash_max; 233 234 u32 multicast_last_member_count; 235 u32 multicast_startup_queries_sent; 236 u32 multicast_startup_query_count; 237 238 unsigned long multicast_last_member_interval; 239 unsigned long multicast_membership_interval; 240 unsigned long multicast_querier_interval; 241 unsigned long multicast_query_interval; 242 unsigned long multicast_query_response_interval; 243 unsigned long multicast_startup_query_interval; 244 245 spinlock_t multicast_lock; 246 struct net_bridge_mdb_htable __rcu *mdb; 247 struct hlist_head router_list; 248 249 struct timer_list multicast_router_timer; 250 struct timer_list multicast_querier_timer; 251 struct timer_list multicast_query_timer; 252 #endif 253 254 struct timer_list hello_timer; 255 struct timer_list tcn_timer; 256 struct timer_list topology_change_timer; 257 struct timer_list gc_timer; 258 struct kobject *ifobj; 259 }; 260 261 struct br_input_skb_cb { 262 struct net_device *brdev; 263 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 264 int igmp; 265 int mrouters_only; 266 #endif 267 }; 268 269 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 270 271 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 272 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 273 #else 274 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 275 #endif 276 277 #define br_printk(level, br, format, args...) \ 278 printk(level "%s: " format, (br)->dev->name, ##args) 279 280 #define br_err(__br, format, args...) \ 281 br_printk(KERN_ERR, __br, format, ##args) 282 #define br_warn(__br, format, args...) \ 283 br_printk(KERN_WARNING, __br, format, ##args) 284 #define br_notice(__br, format, args...) \ 285 br_printk(KERN_NOTICE, __br, format, ##args) 286 #define br_info(__br, format, args...) \ 287 br_printk(KERN_INFO, __br, format, ##args) 288 289 #define br_debug(br, format, args...) \ 290 pr_debug("%s: " format, (br)->dev->name, ##args) 291 292 extern struct notifier_block br_device_notifier; 293 294 /* called under bridge lock */ 295 static inline int br_is_root_bridge(const struct net_bridge *br) 296 { 297 return !memcmp(&br->bridge_id, &br->designated_root, 8); 298 } 299 300 /* br_device.c */ 301 extern void br_dev_setup(struct net_device *dev); 302 extern void br_dev_delete(struct net_device *dev, struct list_head *list); 303 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb, 304 struct net_device *dev); 305 #ifdef CONFIG_NET_POLL_CONTROLLER 306 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) 307 { 308 return br->dev->npinfo; 309 } 310 311 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 312 struct sk_buff *skb) 313 { 314 struct netpoll *np = p->np; 315 316 if (np) 317 netpoll_send_skb(np, skb); 318 } 319 320 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp); 321 extern void br_netpoll_disable(struct net_bridge_port *p); 322 #else 323 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) 324 { 325 return NULL; 326 } 327 328 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 329 struct sk_buff *skb) 330 { 331 } 332 333 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp) 334 { 335 return 0; 336 } 337 338 static inline void br_netpoll_disable(struct net_bridge_port *p) 339 { 340 } 341 #endif 342 343 /* br_fdb.c */ 344 extern int br_fdb_init(void); 345 extern void br_fdb_fini(void); 346 extern void br_fdb_flush(struct net_bridge *br); 347 extern void br_fdb_changeaddr(struct net_bridge_port *p, 348 const unsigned char *newaddr); 349 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 350 extern void br_fdb_cleanup(unsigned long arg); 351 extern void br_fdb_delete_by_port(struct net_bridge *br, 352 const struct net_bridge_port *p, int do_all); 353 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, 354 const unsigned char *addr); 355 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 356 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf, 357 unsigned long count, unsigned long off); 358 extern int br_fdb_insert(struct net_bridge *br, 359 struct net_bridge_port *source, 360 const unsigned char *addr); 361 extern void br_fdb_update(struct net_bridge *br, 362 struct net_bridge_port *source, 363 const unsigned char *addr); 364 365 extern int br_fdb_delete(struct ndmsg *ndm, 366 struct net_device *dev, 367 const unsigned char *addr); 368 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], 369 struct net_device *dev, 370 const unsigned char *addr, 371 u16 nlh_flags); 372 extern int br_fdb_dump(struct sk_buff *skb, 373 struct netlink_callback *cb, 374 struct net_device *dev, 375 int idx); 376 377 /* br_forward.c */ 378 extern void br_deliver(const struct net_bridge_port *to, 379 struct sk_buff *skb); 380 extern int br_dev_queue_push_xmit(struct sk_buff *skb); 381 extern void br_forward(const struct net_bridge_port *to, 382 struct sk_buff *skb, struct sk_buff *skb0); 383 extern int br_forward_finish(struct sk_buff *skb); 384 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb); 385 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, 386 struct sk_buff *skb2); 387 388 /* br_if.c */ 389 extern void br_port_carrier_check(struct net_bridge_port *p); 390 extern int br_add_bridge(struct net *net, const char *name); 391 extern int br_del_bridge(struct net *net, const char *name); 392 extern void br_net_exit(struct net *net); 393 extern int br_add_if(struct net_bridge *br, 394 struct net_device *dev); 395 extern int br_del_if(struct net_bridge *br, 396 struct net_device *dev); 397 extern int br_min_mtu(const struct net_bridge *br); 398 extern netdev_features_t br_features_recompute(struct net_bridge *br, 399 netdev_features_t features); 400 401 /* br_input.c */ 402 extern int br_handle_frame_finish(struct sk_buff *skb); 403 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 404 405 /* br_ioctl.c */ 406 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 407 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg); 408 409 /* br_multicast.c */ 410 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 411 extern int br_multicast_rcv(struct net_bridge *br, 412 struct net_bridge_port *port, 413 struct sk_buff *skb); 414 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 415 struct sk_buff *skb); 416 extern void br_multicast_add_port(struct net_bridge_port *port); 417 extern void br_multicast_del_port(struct net_bridge_port *port); 418 extern void br_multicast_enable_port(struct net_bridge_port *port); 419 extern void br_multicast_disable_port(struct net_bridge_port *port); 420 extern void br_multicast_init(struct net_bridge *br); 421 extern void br_multicast_open(struct net_bridge *br); 422 extern void br_multicast_stop(struct net_bridge *br); 423 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 424 struct sk_buff *skb); 425 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 426 struct sk_buff *skb, struct sk_buff *skb2); 427 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val); 428 extern int br_multicast_set_port_router(struct net_bridge_port *p, 429 unsigned long val); 430 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val); 431 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 432 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 433 434 static inline bool br_multicast_is_router(struct net_bridge *br) 435 { 436 return br->multicast_router == 2 || 437 (br->multicast_router == 1 && 438 timer_pending(&br->multicast_router_timer)); 439 } 440 #else 441 static inline int br_multicast_rcv(struct net_bridge *br, 442 struct net_bridge_port *port, 443 struct sk_buff *skb) 444 { 445 return 0; 446 } 447 448 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 449 struct sk_buff *skb) 450 { 451 return NULL; 452 } 453 454 static inline void br_multicast_add_port(struct net_bridge_port *port) 455 { 456 } 457 458 static inline void br_multicast_del_port(struct net_bridge_port *port) 459 { 460 } 461 462 static inline void br_multicast_enable_port(struct net_bridge_port *port) 463 { 464 } 465 466 static inline void br_multicast_disable_port(struct net_bridge_port *port) 467 { 468 } 469 470 static inline void br_multicast_init(struct net_bridge *br) 471 { 472 } 473 474 static inline void br_multicast_open(struct net_bridge *br) 475 { 476 } 477 478 static inline void br_multicast_stop(struct net_bridge *br) 479 { 480 } 481 482 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 483 struct sk_buff *skb) 484 { 485 } 486 487 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 488 struct sk_buff *skb, 489 struct sk_buff *skb2) 490 { 491 } 492 static inline bool br_multicast_is_router(struct net_bridge *br) 493 { 494 return 0; 495 } 496 #endif 497 498 /* br_netfilter.c */ 499 #ifdef CONFIG_BRIDGE_NETFILTER 500 extern int br_netfilter_init(void); 501 extern void br_netfilter_fini(void); 502 extern void br_netfilter_rtable_init(struct net_bridge *); 503 #else 504 #define br_netfilter_init() (0) 505 #define br_netfilter_fini() do { } while(0) 506 #define br_netfilter_rtable_init(x) 507 #endif 508 509 /* br_stp.c */ 510 extern void br_log_state(const struct net_bridge_port *p); 511 extern struct net_bridge_port *br_get_port(struct net_bridge *br, 512 u16 port_no); 513 extern void br_init_port(struct net_bridge_port *p); 514 extern void br_become_designated_port(struct net_bridge_port *p); 515 516 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x); 517 extern int br_set_hello_time(struct net_bridge *br, unsigned long x); 518 extern int br_set_max_age(struct net_bridge *br, unsigned long x); 519 520 521 /* br_stp_if.c */ 522 extern void br_stp_enable_bridge(struct net_bridge *br); 523 extern void br_stp_disable_bridge(struct net_bridge *br); 524 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 525 extern void br_stp_enable_port(struct net_bridge_port *p); 526 extern void br_stp_disable_port(struct net_bridge_port *p); 527 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br); 528 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 529 extern void br_stp_set_bridge_priority(struct net_bridge *br, 530 u16 newprio); 531 extern int br_stp_set_port_priority(struct net_bridge_port *p, 532 unsigned long newprio); 533 extern int br_stp_set_path_cost(struct net_bridge_port *p, 534 unsigned long path_cost); 535 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 536 537 /* br_stp_bpdu.c */ 538 struct stp_proto; 539 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 540 struct net_device *dev); 541 542 /* br_stp_timer.c */ 543 extern void br_stp_timer_init(struct net_bridge *br); 544 extern void br_stp_port_timer_init(struct net_bridge_port *p); 545 extern unsigned long br_timer_value(const struct timer_list *timer); 546 547 /* br.c */ 548 #if IS_ENABLED(CONFIG_ATM_LANE) 549 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 550 #endif 551 552 /* br_netlink.c */ 553 extern struct rtnl_link_ops br_link_ops; 554 extern int br_netlink_init(void); 555 extern void br_netlink_fini(void); 556 extern void br_ifinfo_notify(int event, struct net_bridge_port *port); 557 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg); 558 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, 559 struct net_device *dev); 560 561 #ifdef CONFIG_SYSFS 562 /* br_sysfs_if.c */ 563 extern const struct sysfs_ops brport_sysfs_ops; 564 extern int br_sysfs_addif(struct net_bridge_port *p); 565 extern int br_sysfs_renameif(struct net_bridge_port *p); 566 567 /* br_sysfs_br.c */ 568 extern int br_sysfs_addbr(struct net_device *dev); 569 extern void br_sysfs_delbr(struct net_device *dev); 570 571 #else 572 573 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 574 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 575 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 576 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 577 #endif /* CONFIG_SYSFS */ 578 579 #endif 580