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 #include <net/ip6_fib.h> 22 #include <linux/if_vlan.h> 23 #include <linux/rhashtable.h> 24 25 #define BR_HASH_BITS 8 26 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 27 28 #define BR_HOLD_TIME (1*HZ) 29 30 #define BR_PORT_BITS 10 31 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 32 33 #define BR_VERSION "2.3" 34 35 /* Control of forwarding link local multicast */ 36 #define BR_GROUPFWD_DEFAULT 0 37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 38 #define BR_GROUPFWD_RESTRICTED 0x0007u 39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 40 #define BR_GROUPFWD_8021AD 0xB801u 41 42 /* Path to usermode spanning tree program */ 43 #define BR_STP_PROG "/sbin/bridge-stp" 44 45 typedef struct bridge_id bridge_id; 46 typedef struct mac_addr mac_addr; 47 typedef __u16 port_id; 48 49 struct bridge_id 50 { 51 unsigned char prio[2]; 52 unsigned char addr[ETH_ALEN]; 53 }; 54 55 struct mac_addr 56 { 57 unsigned char addr[ETH_ALEN]; 58 }; 59 60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 61 /* our own querier */ 62 struct bridge_mcast_own_query { 63 struct timer_list timer; 64 u32 startup_sent; 65 }; 66 67 /* other querier */ 68 struct bridge_mcast_other_query { 69 struct timer_list timer; 70 unsigned long delay_time; 71 }; 72 73 /* selected querier */ 74 struct bridge_mcast_querier { 75 struct br_ip addr; 76 struct net_bridge_port __rcu *port; 77 }; 78 #endif 79 80 struct br_vlan_stats { 81 u64 rx_bytes; 82 u64 rx_packets; 83 u64 tx_bytes; 84 u64 tx_packets; 85 struct u64_stats_sync syncp; 86 }; 87 88 /** 89 * struct net_bridge_vlan - per-vlan entry 90 * 91 * @vnode: rhashtable member 92 * @vid: VLAN id 93 * @flags: bridge vlan flags 94 * @stats: per-cpu VLAN statistics 95 * @br: if MASTER flag set, this points to a bridge struct 96 * @port: if MASTER flag unset, this points to a port struct 97 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 98 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 99 * for this VLAN entry 100 * @vlist: sorted list of VLAN entries 101 * @rcu: used for entry destruction 102 * 103 * This structure is shared between the global per-VLAN entries contained in 104 * the bridge rhashtable and the local per-port per-VLAN entries contained in 105 * the port's rhashtable. The union entries should be interpreted depending on 106 * the entry flags that are set. 107 */ 108 struct net_bridge_vlan { 109 struct rhash_head vnode; 110 u16 vid; 111 u16 flags; 112 struct br_vlan_stats __percpu *stats; 113 union { 114 struct net_bridge *br; 115 struct net_bridge_port *port; 116 }; 117 union { 118 atomic_t refcnt; 119 struct net_bridge_vlan *brvlan; 120 }; 121 struct list_head vlist; 122 123 struct rcu_head rcu; 124 }; 125 126 /** 127 * struct net_bridge_vlan_group 128 * 129 * @vlan_hash: VLAN entry rhashtable 130 * @vlan_list: sorted VLAN entry list 131 * @num_vlans: number of total VLAN entries 132 * @pvid: PVID VLAN id 133 * 134 * IMPORTANT: Be careful when checking if there're VLAN entries using list 135 * primitives because the bridge can have entries in its list which 136 * are just for global context but not for filtering, i.e. they have 137 * the master flag set but not the brentry flag. If you have to check 138 * if there're "real" entries in the bridge please test @num_vlans 139 */ 140 struct net_bridge_vlan_group { 141 struct rhashtable vlan_hash; 142 struct list_head vlan_list; 143 u16 num_vlans; 144 u16 pvid; 145 }; 146 147 struct net_bridge_fdb_entry 148 { 149 struct hlist_node hlist; 150 struct net_bridge_port *dst; 151 152 unsigned long updated; 153 unsigned long used; 154 mac_addr addr; 155 __u16 vlan_id; 156 unsigned char is_local:1, 157 is_static:1, 158 added_by_user:1, 159 added_by_external_learn:1; 160 struct rcu_head rcu; 161 }; 162 163 #define MDB_PG_FLAGS_PERMANENT BIT(0) 164 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 165 166 struct net_bridge_port_group { 167 struct net_bridge_port *port; 168 struct net_bridge_port_group __rcu *next; 169 struct hlist_node mglist; 170 struct rcu_head rcu; 171 struct timer_list timer; 172 struct br_ip addr; 173 unsigned char flags; 174 }; 175 176 struct net_bridge_mdb_entry 177 { 178 struct hlist_node hlist[2]; 179 struct net_bridge *br; 180 struct net_bridge_port_group __rcu *ports; 181 struct rcu_head rcu; 182 struct timer_list timer; 183 struct br_ip addr; 184 bool mglist; 185 }; 186 187 struct net_bridge_mdb_htable 188 { 189 struct hlist_head *mhash; 190 struct rcu_head rcu; 191 struct net_bridge_mdb_htable *old; 192 u32 size; 193 u32 max; 194 u32 secret; 195 u32 ver; 196 }; 197 198 struct net_bridge_port 199 { 200 struct net_bridge *br; 201 struct net_device *dev; 202 struct list_head list; 203 204 /* STP */ 205 u8 priority; 206 u8 state; 207 u16 port_no; 208 unsigned char topology_change_ack; 209 unsigned char config_pending; 210 port_id port_id; 211 port_id designated_port; 212 bridge_id designated_root; 213 bridge_id designated_bridge; 214 u32 path_cost; 215 u32 designated_cost; 216 unsigned long designated_age; 217 218 struct timer_list forward_delay_timer; 219 struct timer_list hold_timer; 220 struct timer_list message_age_timer; 221 struct kobject kobj; 222 struct rcu_head rcu; 223 224 unsigned long flags; 225 226 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 227 struct bridge_mcast_own_query ip4_own_query; 228 #if IS_ENABLED(CONFIG_IPV6) 229 struct bridge_mcast_own_query ip6_own_query; 230 #endif /* IS_ENABLED(CONFIG_IPV6) */ 231 unsigned char multicast_router; 232 struct timer_list multicast_router_timer; 233 struct hlist_head mglist; 234 struct hlist_node rlist; 235 #endif 236 237 #ifdef CONFIG_SYSFS 238 char sysfs_name[IFNAMSIZ]; 239 #endif 240 241 #ifdef CONFIG_NET_POLL_CONTROLLER 242 struct netpoll *np; 243 #endif 244 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 245 struct net_bridge_vlan_group __rcu *vlgrp; 246 #endif 247 }; 248 249 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 250 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 251 252 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 253 254 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 255 { 256 return rcu_dereference(dev->rx_handler_data); 257 } 258 259 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 260 { 261 return br_port_exists(dev) ? 262 rtnl_dereference(dev->rx_handler_data) : NULL; 263 } 264 265 struct net_bridge 266 { 267 spinlock_t lock; 268 struct list_head port_list; 269 struct net_device *dev; 270 271 struct pcpu_sw_netstats __percpu *stats; 272 spinlock_t hash_lock; 273 struct hlist_head hash[BR_HASH_SIZE]; 274 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 275 union { 276 struct rtable fake_rtable; 277 struct rt6_info fake_rt6_info; 278 }; 279 bool nf_call_iptables; 280 bool nf_call_ip6tables; 281 bool nf_call_arptables; 282 #endif 283 u16 group_fwd_mask; 284 u16 group_fwd_mask_required; 285 286 /* STP */ 287 bridge_id designated_root; 288 bridge_id bridge_id; 289 u32 root_path_cost; 290 unsigned long max_age; 291 unsigned long hello_time; 292 unsigned long forward_delay; 293 unsigned long bridge_max_age; 294 unsigned long ageing_time; 295 unsigned long bridge_hello_time; 296 unsigned long bridge_forward_delay; 297 298 u8 group_addr[ETH_ALEN]; 299 bool group_addr_set; 300 u16 root_port; 301 302 enum { 303 BR_NO_STP, /* no spanning tree */ 304 BR_KERNEL_STP, /* old STP in kernel */ 305 BR_USER_STP, /* new RSTP in userspace */ 306 } stp_enabled; 307 308 unsigned char topology_change; 309 unsigned char topology_change_detected; 310 311 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 312 unsigned char multicast_router; 313 314 u8 multicast_disabled:1; 315 u8 multicast_querier:1; 316 u8 multicast_query_use_ifaddr:1; 317 u8 has_ipv6_addr:1; 318 319 u32 hash_elasticity; 320 u32 hash_max; 321 322 u32 multicast_last_member_count; 323 u32 multicast_startup_query_count; 324 325 unsigned long multicast_last_member_interval; 326 unsigned long multicast_membership_interval; 327 unsigned long multicast_querier_interval; 328 unsigned long multicast_query_interval; 329 unsigned long multicast_query_response_interval; 330 unsigned long multicast_startup_query_interval; 331 332 spinlock_t multicast_lock; 333 struct net_bridge_mdb_htable __rcu *mdb; 334 struct hlist_head router_list; 335 336 struct timer_list multicast_router_timer; 337 struct bridge_mcast_other_query ip4_other_query; 338 struct bridge_mcast_own_query ip4_own_query; 339 struct bridge_mcast_querier ip4_querier; 340 #if IS_ENABLED(CONFIG_IPV6) 341 struct bridge_mcast_other_query ip6_other_query; 342 struct bridge_mcast_own_query ip6_own_query; 343 struct bridge_mcast_querier ip6_querier; 344 #endif /* IS_ENABLED(CONFIG_IPV6) */ 345 #endif 346 347 struct timer_list hello_timer; 348 struct timer_list tcn_timer; 349 struct timer_list topology_change_timer; 350 struct timer_list gc_timer; 351 struct kobject *ifobj; 352 u32 auto_cnt; 353 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 354 struct net_bridge_vlan_group __rcu *vlgrp; 355 u8 vlan_enabled; 356 u8 vlan_stats_enabled; 357 __be16 vlan_proto; 358 u16 default_pvid; 359 #endif 360 }; 361 362 struct br_input_skb_cb { 363 struct net_device *brdev; 364 365 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 366 int igmp; 367 int mrouters_only; 368 #endif 369 370 bool proxyarp_replied; 371 372 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 373 bool vlan_filtered; 374 #endif 375 }; 376 377 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 378 379 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 380 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 381 #else 382 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 383 #endif 384 385 #define br_printk(level, br, format, args...) \ 386 printk(level "%s: " format, (br)->dev->name, ##args) 387 388 #define br_err(__br, format, args...) \ 389 br_printk(KERN_ERR, __br, format, ##args) 390 #define br_warn(__br, format, args...) \ 391 br_printk(KERN_WARNING, __br, format, ##args) 392 #define br_notice(__br, format, args...) \ 393 br_printk(KERN_NOTICE, __br, format, ##args) 394 #define br_info(__br, format, args...) \ 395 br_printk(KERN_INFO, __br, format, ##args) 396 397 #define br_debug(br, format, args...) \ 398 pr_debug("%s: " format, (br)->dev->name, ##args) 399 400 /* called under bridge lock */ 401 static inline int br_is_root_bridge(const struct net_bridge *br) 402 { 403 return !memcmp(&br->bridge_id, &br->designated_root, 8); 404 } 405 406 /* check if a VLAN entry is global */ 407 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 408 { 409 return v->flags & BRIDGE_VLAN_INFO_MASTER; 410 } 411 412 /* check if a VLAN entry is used by the bridge */ 413 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 414 { 415 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 416 } 417 418 /* check if we should use the vlan entry, returns false if it's only context */ 419 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 420 { 421 if (br_vlan_is_master(v)) { 422 if (br_vlan_is_brentry(v)) 423 return true; 424 else 425 return false; 426 } 427 428 return true; 429 } 430 431 /* br_device.c */ 432 void br_dev_setup(struct net_device *dev); 433 void br_dev_delete(struct net_device *dev, struct list_head *list); 434 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 435 #ifdef CONFIG_NET_POLL_CONTROLLER 436 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 437 struct sk_buff *skb) 438 { 439 struct netpoll *np = p->np; 440 441 if (np) 442 netpoll_send_skb(np, skb); 443 } 444 445 int br_netpoll_enable(struct net_bridge_port *p); 446 void br_netpoll_disable(struct net_bridge_port *p); 447 #else 448 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 449 struct sk_buff *skb) 450 { 451 } 452 453 static inline int br_netpoll_enable(struct net_bridge_port *p) 454 { 455 return 0; 456 } 457 458 static inline void br_netpoll_disable(struct net_bridge_port *p) 459 { 460 } 461 #endif 462 463 /* br_fdb.c */ 464 int br_fdb_init(void); 465 void br_fdb_fini(void); 466 void br_fdb_flush(struct net_bridge *br); 467 void br_fdb_find_delete_local(struct net_bridge *br, 468 const struct net_bridge_port *p, 469 const unsigned char *addr, u16 vid); 470 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 471 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 472 void br_fdb_cleanup(unsigned long arg); 473 void br_fdb_delete_by_port(struct net_bridge *br, 474 const struct net_bridge_port *p, u16 vid, int do_all); 475 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, 476 const unsigned char *addr, __u16 vid); 477 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 478 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 479 unsigned long off); 480 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 481 const unsigned char *addr, u16 vid); 482 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 483 const unsigned char *addr, u16 vid, bool added_by_user); 484 485 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 486 struct net_device *dev, const unsigned char *addr, u16 vid); 487 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 488 const unsigned char *addr, u16 vid, u16 nlh_flags); 489 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 490 struct net_device *dev, struct net_device *fdev, int idx); 491 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 492 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 493 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 494 const unsigned char *addr, u16 vid); 495 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 496 const unsigned char *addr, u16 vid); 497 498 /* br_forward.c */ 499 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb); 500 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 501 void br_forward(const struct net_bridge_port *to, 502 struct sk_buff *skb, struct sk_buff *skb0); 503 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 504 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast); 505 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, 506 struct sk_buff *skb2, bool unicast); 507 508 /* br_if.c */ 509 void br_port_carrier_check(struct net_bridge_port *p); 510 int br_add_bridge(struct net *net, const char *name); 511 int br_del_bridge(struct net *net, const char *name); 512 int br_add_if(struct net_bridge *br, struct net_device *dev); 513 int br_del_if(struct net_bridge *br, struct net_device *dev); 514 int br_min_mtu(const struct net_bridge *br); 515 netdev_features_t br_features_recompute(struct net_bridge *br, 516 netdev_features_t features); 517 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 518 void br_manage_promisc(struct net_bridge *br); 519 520 /* br_input.c */ 521 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 522 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 523 524 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 525 { 526 return rcu_dereference(dev->rx_handler) == br_handle_frame; 527 } 528 529 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 530 { 531 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 532 } 533 534 /* br_ioctl.c */ 535 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 536 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 537 void __user *arg); 538 539 /* br_multicast.c */ 540 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 541 extern unsigned int br_mdb_rehash_seq; 542 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 543 struct sk_buff *skb, u16 vid); 544 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 545 struct sk_buff *skb, u16 vid); 546 void br_multicast_add_port(struct net_bridge_port *port); 547 void br_multicast_del_port(struct net_bridge_port *port); 548 void br_multicast_enable_port(struct net_bridge_port *port); 549 void br_multicast_disable_port(struct net_bridge_port *port); 550 void br_multicast_init(struct net_bridge *br); 551 void br_multicast_open(struct net_bridge *br); 552 void br_multicast_stop(struct net_bridge *br); 553 void br_multicast_dev_del(struct net_bridge *br); 554 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 555 struct sk_buff *skb); 556 void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 557 struct sk_buff *skb, struct sk_buff *skb2); 558 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 559 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 560 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 561 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 562 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 563 struct net_bridge_mdb_entry * 564 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 565 struct net_bridge_mdb_entry * 566 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 567 struct br_ip *group); 568 void br_multicast_free_pg(struct rcu_head *head); 569 struct net_bridge_port_group * 570 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 571 struct net_bridge_port_group __rcu *next, 572 unsigned char flags); 573 void br_mdb_init(void); 574 void br_mdb_uninit(void); 575 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 576 struct br_ip *group, int type, u8 flags); 577 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 578 int type); 579 580 #define mlock_dereference(X, br) \ 581 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 582 583 static inline bool br_multicast_is_router(struct net_bridge *br) 584 { 585 return br->multicast_router == 2 || 586 (br->multicast_router == 1 && 587 timer_pending(&br->multicast_router_timer)); 588 } 589 590 static inline bool 591 __br_multicast_querier_exists(struct net_bridge *br, 592 struct bridge_mcast_other_query *querier, 593 const bool is_ipv6) 594 { 595 bool own_querier_enabled; 596 597 if (br->multicast_querier) { 598 if (is_ipv6 && !br->has_ipv6_addr) 599 own_querier_enabled = false; 600 else 601 own_querier_enabled = true; 602 } else { 603 own_querier_enabled = false; 604 } 605 606 return time_is_before_jiffies(querier->delay_time) && 607 (own_querier_enabled || timer_pending(&querier->timer)); 608 } 609 610 static inline bool br_multicast_querier_exists(struct net_bridge *br, 611 struct ethhdr *eth) 612 { 613 switch (eth->h_proto) { 614 case (htons(ETH_P_IP)): 615 return __br_multicast_querier_exists(br, 616 &br->ip4_other_query, false); 617 #if IS_ENABLED(CONFIG_IPV6) 618 case (htons(ETH_P_IPV6)): 619 return __br_multicast_querier_exists(br, 620 &br->ip6_other_query, true); 621 #endif 622 default: 623 return false; 624 } 625 } 626 #else 627 static inline int br_multicast_rcv(struct net_bridge *br, 628 struct net_bridge_port *port, 629 struct sk_buff *skb, 630 u16 vid) 631 { 632 return 0; 633 } 634 635 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 636 struct sk_buff *skb, u16 vid) 637 { 638 return NULL; 639 } 640 641 static inline void br_multicast_add_port(struct net_bridge_port *port) 642 { 643 } 644 645 static inline void br_multicast_del_port(struct net_bridge_port *port) 646 { 647 } 648 649 static inline void br_multicast_enable_port(struct net_bridge_port *port) 650 { 651 } 652 653 static inline void br_multicast_disable_port(struct net_bridge_port *port) 654 { 655 } 656 657 static inline void br_multicast_init(struct net_bridge *br) 658 { 659 } 660 661 static inline void br_multicast_open(struct net_bridge *br) 662 { 663 } 664 665 static inline void br_multicast_stop(struct net_bridge *br) 666 { 667 } 668 669 static inline void br_multicast_dev_del(struct net_bridge *br) 670 { 671 } 672 673 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, 674 struct sk_buff *skb) 675 { 676 } 677 678 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst, 679 struct sk_buff *skb, 680 struct sk_buff *skb2) 681 { 682 } 683 static inline bool br_multicast_is_router(struct net_bridge *br) 684 { 685 return 0; 686 } 687 static inline bool br_multicast_querier_exists(struct net_bridge *br, 688 struct ethhdr *eth) 689 { 690 return false; 691 } 692 static inline void br_mdb_init(void) 693 { 694 } 695 static inline void br_mdb_uninit(void) 696 { 697 } 698 #endif 699 700 /* br_vlan.c */ 701 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 702 bool br_allowed_ingress(const struct net_bridge *br, 703 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 704 u16 *vid); 705 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 706 const struct sk_buff *skb); 707 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 708 struct sk_buff *br_handle_vlan(struct net_bridge *br, 709 struct net_bridge_vlan_group *vg, 710 struct sk_buff *skb); 711 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 712 int br_vlan_delete(struct net_bridge *br, u16 vid); 713 void br_vlan_flush(struct net_bridge *br); 714 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 715 void br_recalculate_fwd_mask(struct net_bridge *br); 716 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 717 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 718 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 719 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 720 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 721 int br_vlan_init(struct net_bridge *br); 722 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 723 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 724 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 725 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 726 void nbp_vlan_flush(struct net_bridge_port *port); 727 int nbp_vlan_init(struct net_bridge_port *port); 728 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 729 void br_vlan_get_stats(const struct net_bridge_vlan *v, 730 struct br_vlan_stats *stats); 731 732 static inline struct net_bridge_vlan_group *br_vlan_group( 733 const struct net_bridge *br) 734 { 735 return rtnl_dereference(br->vlgrp); 736 } 737 738 static inline struct net_bridge_vlan_group *nbp_vlan_group( 739 const struct net_bridge_port *p) 740 { 741 return rtnl_dereference(p->vlgrp); 742 } 743 744 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 745 const struct net_bridge *br) 746 { 747 return rcu_dereference(br->vlgrp); 748 } 749 750 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 751 const struct net_bridge_port *p) 752 { 753 return rcu_dereference(p->vlgrp); 754 } 755 756 /* Since bridge now depends on 8021Q module, but the time bridge sees the 757 * skb, the vlan tag will always be present if the frame was tagged. 758 */ 759 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 760 { 761 int err = 0; 762 763 if (skb_vlan_tag_present(skb)) { 764 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 765 } else { 766 *vid = 0; 767 err = -EINVAL; 768 } 769 770 return err; 771 } 772 773 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 774 { 775 if (!vg) 776 return 0; 777 778 smp_rmb(); 779 return vg->pvid; 780 } 781 782 static inline int br_vlan_enabled(struct net_bridge *br) 783 { 784 return br->vlan_enabled; 785 } 786 #else 787 static inline bool br_allowed_ingress(const struct net_bridge *br, 788 struct net_bridge_vlan_group *vg, 789 struct sk_buff *skb, 790 u16 *vid) 791 { 792 return true; 793 } 794 795 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 796 const struct sk_buff *skb) 797 { 798 return true; 799 } 800 801 static inline bool br_should_learn(struct net_bridge_port *p, 802 struct sk_buff *skb, u16 *vid) 803 { 804 return true; 805 } 806 807 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 808 struct net_bridge_vlan_group *vg, 809 struct sk_buff *skb) 810 { 811 return skb; 812 } 813 814 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 815 { 816 return -EOPNOTSUPP; 817 } 818 819 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 820 { 821 return -EOPNOTSUPP; 822 } 823 824 static inline void br_vlan_flush(struct net_bridge *br) 825 { 826 } 827 828 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 829 { 830 } 831 832 static inline int br_vlan_init(struct net_bridge *br) 833 { 834 return 0; 835 } 836 837 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 838 { 839 return -EOPNOTSUPP; 840 } 841 842 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 843 { 844 return -EOPNOTSUPP; 845 } 846 847 static inline void nbp_vlan_flush(struct net_bridge_port *port) 848 { 849 } 850 851 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 852 u16 vid) 853 { 854 return NULL; 855 } 856 857 static inline int nbp_vlan_init(struct net_bridge_port *port) 858 { 859 return 0; 860 } 861 862 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 863 { 864 return 0; 865 } 866 867 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 868 { 869 return 0; 870 } 871 872 static inline int br_vlan_enabled(struct net_bridge *br) 873 { 874 return 0; 875 } 876 877 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 878 unsigned long val) 879 { 880 return -EOPNOTSUPP; 881 } 882 883 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 884 u32 filter_mask) 885 { 886 return 0; 887 } 888 889 static inline struct net_bridge_vlan_group *br_vlan_group( 890 const struct net_bridge *br) 891 { 892 return NULL; 893 } 894 895 static inline struct net_bridge_vlan_group *nbp_vlan_group( 896 const struct net_bridge_port *p) 897 { 898 return NULL; 899 } 900 901 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 902 const struct net_bridge *br) 903 { 904 return NULL; 905 } 906 907 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 908 const struct net_bridge_port *p) 909 { 910 return NULL; 911 } 912 913 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 914 struct br_vlan_stats *stats) 915 { 916 } 917 #endif 918 919 struct nf_br_ops { 920 int (*br_dev_xmit_hook)(struct sk_buff *skb); 921 }; 922 extern const struct nf_br_ops __rcu *nf_br_ops; 923 924 /* br_netfilter.c */ 925 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 926 int br_nf_core_init(void); 927 void br_nf_core_fini(void); 928 void br_netfilter_rtable_init(struct net_bridge *); 929 #else 930 static inline int br_nf_core_init(void) { return 0; } 931 static inline void br_nf_core_fini(void) {} 932 #define br_netfilter_rtable_init(x) 933 #endif 934 935 /* br_stp.c */ 936 void br_set_state(struct net_bridge_port *p, unsigned int state); 937 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 938 void br_init_port(struct net_bridge_port *p); 939 void br_become_designated_port(struct net_bridge_port *p); 940 941 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 942 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 943 int br_set_hello_time(struct net_bridge *br, unsigned long x); 944 int br_set_max_age(struct net_bridge *br, unsigned long x); 945 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time); 946 947 948 /* br_stp_if.c */ 949 void br_stp_enable_bridge(struct net_bridge *br); 950 void br_stp_disable_bridge(struct net_bridge *br); 951 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 952 void br_stp_enable_port(struct net_bridge_port *p); 953 void br_stp_disable_port(struct net_bridge_port *p); 954 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 955 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 956 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 957 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 958 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 959 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 960 961 /* br_stp_bpdu.c */ 962 struct stp_proto; 963 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 964 struct net_device *dev); 965 966 /* br_stp_timer.c */ 967 void br_stp_timer_init(struct net_bridge *br); 968 void br_stp_port_timer_init(struct net_bridge_port *p); 969 unsigned long br_timer_value(const struct timer_list *timer); 970 971 /* br.c */ 972 #if IS_ENABLED(CONFIG_ATM_LANE) 973 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 974 #endif 975 976 /* br_netlink.c */ 977 extern struct rtnl_link_ops br_link_ops; 978 int br_netlink_init(void); 979 void br_netlink_fini(void); 980 void br_ifinfo_notify(int event, struct net_bridge_port *port); 981 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 982 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 983 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 984 u32 filter_mask, int nlflags); 985 986 #ifdef CONFIG_SYSFS 987 /* br_sysfs_if.c */ 988 extern const struct sysfs_ops brport_sysfs_ops; 989 int br_sysfs_addif(struct net_bridge_port *p); 990 int br_sysfs_renameif(struct net_bridge_port *p); 991 992 /* br_sysfs_br.c */ 993 int br_sysfs_addbr(struct net_device *dev); 994 void br_sysfs_delbr(struct net_device *dev); 995 996 #else 997 998 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 999 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1000 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1001 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1002 #endif /* CONFIG_SYSFS */ 1003 1004 #endif 1005