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 79 /* IGMP/MLD statistics */ 80 struct bridge_mcast_stats { 81 struct br_mcast_stats mstats; 82 struct u64_stats_sync syncp; 83 }; 84 #endif 85 86 struct br_vlan_stats { 87 u64 rx_bytes; 88 u64 rx_packets; 89 u64 tx_bytes; 90 u64 tx_packets; 91 struct u64_stats_sync syncp; 92 }; 93 94 /** 95 * struct net_bridge_vlan - per-vlan entry 96 * 97 * @vnode: rhashtable member 98 * @vid: VLAN id 99 * @flags: bridge vlan flags 100 * @stats: per-cpu VLAN statistics 101 * @br: if MASTER flag set, this points to a bridge struct 102 * @port: if MASTER flag unset, this points to a port struct 103 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 104 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 105 * for this VLAN entry 106 * @vlist: sorted list of VLAN entries 107 * @rcu: used for entry destruction 108 * 109 * This structure is shared between the global per-VLAN entries contained in 110 * the bridge rhashtable and the local per-port per-VLAN entries contained in 111 * the port's rhashtable. The union entries should be interpreted depending on 112 * the entry flags that are set. 113 */ 114 struct net_bridge_vlan { 115 struct rhash_head vnode; 116 u16 vid; 117 u16 flags; 118 struct br_vlan_stats __percpu *stats; 119 union { 120 struct net_bridge *br; 121 struct net_bridge_port *port; 122 }; 123 union { 124 atomic_t refcnt; 125 struct net_bridge_vlan *brvlan; 126 }; 127 struct list_head vlist; 128 129 struct rcu_head rcu; 130 }; 131 132 /** 133 * struct net_bridge_vlan_group 134 * 135 * @vlan_hash: VLAN entry rhashtable 136 * @vlan_list: sorted VLAN entry list 137 * @num_vlans: number of total VLAN entries 138 * @pvid: PVID VLAN id 139 * 140 * IMPORTANT: Be careful when checking if there're VLAN entries using list 141 * primitives because the bridge can have entries in its list which 142 * are just for global context but not for filtering, i.e. they have 143 * the master flag set but not the brentry flag. If you have to check 144 * if there're "real" entries in the bridge please test @num_vlans 145 */ 146 struct net_bridge_vlan_group { 147 struct rhashtable vlan_hash; 148 struct list_head vlan_list; 149 u16 num_vlans; 150 u16 pvid; 151 }; 152 153 struct net_bridge_fdb_entry 154 { 155 struct hlist_node hlist; 156 struct net_bridge_port *dst; 157 158 unsigned long updated; 159 unsigned long used; 160 mac_addr addr; 161 __u16 vlan_id; 162 unsigned char is_local:1, 163 is_static:1, 164 added_by_user:1, 165 added_by_external_learn:1; 166 struct rcu_head rcu; 167 }; 168 169 #define MDB_PG_FLAGS_PERMANENT BIT(0) 170 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 171 172 struct net_bridge_port_group { 173 struct net_bridge_port *port; 174 struct net_bridge_port_group __rcu *next; 175 struct hlist_node mglist; 176 struct rcu_head rcu; 177 struct timer_list timer; 178 struct br_ip addr; 179 unsigned char flags; 180 }; 181 182 struct net_bridge_mdb_entry 183 { 184 struct hlist_node hlist[2]; 185 struct net_bridge *br; 186 struct net_bridge_port_group __rcu *ports; 187 struct rcu_head rcu; 188 struct timer_list timer; 189 struct br_ip addr; 190 bool mglist; 191 }; 192 193 struct net_bridge_mdb_htable 194 { 195 struct hlist_head *mhash; 196 struct rcu_head rcu; 197 struct net_bridge_mdb_htable *old; 198 u32 size; 199 u32 max; 200 u32 secret; 201 u32 ver; 202 }; 203 204 struct net_bridge_port 205 { 206 struct net_bridge *br; 207 struct net_device *dev; 208 struct list_head list; 209 210 /* STP */ 211 u8 priority; 212 u8 state; 213 u16 port_no; 214 unsigned char topology_change_ack; 215 unsigned char config_pending; 216 port_id port_id; 217 port_id designated_port; 218 bridge_id designated_root; 219 bridge_id designated_bridge; 220 u32 path_cost; 221 u32 designated_cost; 222 unsigned long designated_age; 223 224 struct timer_list forward_delay_timer; 225 struct timer_list hold_timer; 226 struct timer_list message_age_timer; 227 struct kobject kobj; 228 struct rcu_head rcu; 229 230 unsigned long flags; 231 232 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 233 struct bridge_mcast_own_query ip4_own_query; 234 #if IS_ENABLED(CONFIG_IPV6) 235 struct bridge_mcast_own_query ip6_own_query; 236 #endif /* IS_ENABLED(CONFIG_IPV6) */ 237 unsigned char multicast_router; 238 struct bridge_mcast_stats __percpu *mcast_stats; 239 struct timer_list multicast_router_timer; 240 struct hlist_head mglist; 241 struct hlist_node rlist; 242 #endif 243 244 #ifdef CONFIG_SYSFS 245 char sysfs_name[IFNAMSIZ]; 246 #endif 247 248 #ifdef CONFIG_NET_POLL_CONTROLLER 249 struct netpoll *np; 250 #endif 251 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 252 struct net_bridge_vlan_group __rcu *vlgrp; 253 #endif 254 #ifdef CONFIG_NET_SWITCHDEV 255 int offload_fwd_mark; 256 #endif 257 }; 258 259 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 260 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 261 262 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 263 264 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 265 { 266 return rcu_dereference(dev->rx_handler_data); 267 } 268 269 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 270 { 271 return br_port_exists(dev) ? 272 rtnl_dereference(dev->rx_handler_data) : NULL; 273 } 274 275 struct net_bridge 276 { 277 spinlock_t lock; 278 struct list_head port_list; 279 struct net_device *dev; 280 281 struct pcpu_sw_netstats __percpu *stats; 282 spinlock_t hash_lock; 283 struct hlist_head hash[BR_HASH_SIZE]; 284 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 285 union { 286 struct rtable fake_rtable; 287 struct rt6_info fake_rt6_info; 288 }; 289 bool nf_call_iptables; 290 bool nf_call_ip6tables; 291 bool nf_call_arptables; 292 #endif 293 u16 group_fwd_mask; 294 u16 group_fwd_mask_required; 295 296 /* STP */ 297 bridge_id designated_root; 298 bridge_id bridge_id; 299 u32 root_path_cost; 300 unsigned long max_age; 301 unsigned long hello_time; 302 unsigned long forward_delay; 303 unsigned long ageing_time; 304 unsigned long bridge_max_age; 305 unsigned long bridge_hello_time; 306 unsigned long bridge_forward_delay; 307 unsigned long bridge_ageing_time; 308 309 u8 group_addr[ETH_ALEN]; 310 bool group_addr_set; 311 u16 root_port; 312 313 enum { 314 BR_NO_STP, /* no spanning tree */ 315 BR_KERNEL_STP, /* old STP in kernel */ 316 BR_USER_STP, /* new RSTP in userspace */ 317 } stp_enabled; 318 319 unsigned char topology_change; 320 unsigned char topology_change_detected; 321 322 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 323 unsigned char multicast_router; 324 325 u8 multicast_disabled:1; 326 u8 multicast_querier:1; 327 u8 multicast_query_use_ifaddr:1; 328 u8 has_ipv6_addr:1; 329 u8 multicast_stats_enabled:1; 330 331 u32 hash_elasticity; 332 u32 hash_max; 333 334 u32 multicast_last_member_count; 335 u32 multicast_startup_query_count; 336 337 u8 multicast_igmp_version; 338 339 unsigned long multicast_last_member_interval; 340 unsigned long multicast_membership_interval; 341 unsigned long multicast_querier_interval; 342 unsigned long multicast_query_interval; 343 unsigned long multicast_query_response_interval; 344 unsigned long multicast_startup_query_interval; 345 346 spinlock_t multicast_lock; 347 struct net_bridge_mdb_htable __rcu *mdb; 348 struct hlist_head router_list; 349 350 struct timer_list multicast_router_timer; 351 struct bridge_mcast_other_query ip4_other_query; 352 struct bridge_mcast_own_query ip4_own_query; 353 struct bridge_mcast_querier ip4_querier; 354 struct bridge_mcast_stats __percpu *mcast_stats; 355 #if IS_ENABLED(CONFIG_IPV6) 356 struct bridge_mcast_other_query ip6_other_query; 357 struct bridge_mcast_own_query ip6_own_query; 358 struct bridge_mcast_querier ip6_querier; 359 u8 multicast_mld_version; 360 #endif /* IS_ENABLED(CONFIG_IPV6) */ 361 #endif 362 363 struct timer_list hello_timer; 364 struct timer_list tcn_timer; 365 struct timer_list topology_change_timer; 366 struct timer_list gc_timer; 367 struct kobject *ifobj; 368 u32 auto_cnt; 369 370 #ifdef CONFIG_NET_SWITCHDEV 371 int offload_fwd_mark; 372 #endif 373 374 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 375 struct net_bridge_vlan_group __rcu *vlgrp; 376 u8 vlan_enabled; 377 u8 vlan_stats_enabled; 378 __be16 vlan_proto; 379 u16 default_pvid; 380 #endif 381 }; 382 383 struct br_input_skb_cb { 384 struct net_device *brdev; 385 386 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 387 int igmp; 388 int mrouters_only; 389 #endif 390 391 bool proxyarp_replied; 392 393 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 394 bool vlan_filtered; 395 #endif 396 397 #ifdef CONFIG_NET_SWITCHDEV 398 int offload_fwd_mark; 399 #endif 400 }; 401 402 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 403 404 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 405 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 406 #else 407 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 408 #endif 409 410 #define br_printk(level, br, format, args...) \ 411 printk(level "%s: " format, (br)->dev->name, ##args) 412 413 #define br_err(__br, format, args...) \ 414 br_printk(KERN_ERR, __br, format, ##args) 415 #define br_warn(__br, format, args...) \ 416 br_printk(KERN_WARNING, __br, format, ##args) 417 #define br_notice(__br, format, args...) \ 418 br_printk(KERN_NOTICE, __br, format, ##args) 419 #define br_info(__br, format, args...) \ 420 br_printk(KERN_INFO, __br, format, ##args) 421 422 #define br_debug(br, format, args...) \ 423 pr_debug("%s: " format, (br)->dev->name, ##args) 424 425 /* called under bridge lock */ 426 static inline int br_is_root_bridge(const struct net_bridge *br) 427 { 428 return !memcmp(&br->bridge_id, &br->designated_root, 8); 429 } 430 431 /* check if a VLAN entry is global */ 432 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 433 { 434 return v->flags & BRIDGE_VLAN_INFO_MASTER; 435 } 436 437 /* check if a VLAN entry is used by the bridge */ 438 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 439 { 440 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 441 } 442 443 /* check if we should use the vlan entry, returns false if it's only context */ 444 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 445 { 446 if (br_vlan_is_master(v)) { 447 if (br_vlan_is_brentry(v)) 448 return true; 449 else 450 return false; 451 } 452 453 return true; 454 } 455 456 /* br_device.c */ 457 void br_dev_setup(struct net_device *dev); 458 void br_dev_delete(struct net_device *dev, struct list_head *list); 459 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 460 #ifdef CONFIG_NET_POLL_CONTROLLER 461 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 462 struct sk_buff *skb) 463 { 464 struct netpoll *np = p->np; 465 466 if (np) 467 netpoll_send_skb(np, skb); 468 } 469 470 int br_netpoll_enable(struct net_bridge_port *p); 471 void br_netpoll_disable(struct net_bridge_port *p); 472 #else 473 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 474 struct sk_buff *skb) 475 { 476 } 477 478 static inline int br_netpoll_enable(struct net_bridge_port *p) 479 { 480 return 0; 481 } 482 483 static inline void br_netpoll_disable(struct net_bridge_port *p) 484 { 485 } 486 #endif 487 488 /* br_fdb.c */ 489 int br_fdb_init(void); 490 void br_fdb_fini(void); 491 void br_fdb_flush(struct net_bridge *br); 492 void br_fdb_find_delete_local(struct net_bridge *br, 493 const struct net_bridge_port *p, 494 const unsigned char *addr, u16 vid); 495 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 496 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 497 void br_fdb_cleanup(unsigned long arg); 498 void br_fdb_delete_by_port(struct net_bridge *br, 499 const struct net_bridge_port *p, u16 vid, int do_all); 500 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, 501 const unsigned char *addr, __u16 vid); 502 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 503 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 504 unsigned long off); 505 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 506 const unsigned char *addr, u16 vid); 507 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 508 const unsigned char *addr, u16 vid, bool added_by_user); 509 510 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 511 struct net_device *dev, const unsigned char *addr, u16 vid); 512 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 513 const unsigned char *addr, u16 vid, u16 nlh_flags); 514 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 515 struct net_device *dev, struct net_device *fdev, int *idx); 516 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 517 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 518 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 519 const unsigned char *addr, u16 vid); 520 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 521 const unsigned char *addr, u16 vid); 522 523 /* br_forward.c */ 524 enum br_pkt_type { 525 BR_PKT_UNICAST, 526 BR_PKT_MULTICAST, 527 BR_PKT_BROADCAST 528 }; 529 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 530 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 531 bool local_rcv, bool local_orig); 532 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 533 void br_flood(struct net_bridge *br, struct sk_buff *skb, 534 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 535 536 /* br_if.c */ 537 void br_port_carrier_check(struct net_bridge_port *p); 538 int br_add_bridge(struct net *net, const char *name); 539 int br_del_bridge(struct net *net, const char *name); 540 int br_add_if(struct net_bridge *br, struct net_device *dev); 541 int br_del_if(struct net_bridge *br, struct net_device *dev); 542 int br_min_mtu(const struct net_bridge *br); 543 netdev_features_t br_features_recompute(struct net_bridge *br, 544 netdev_features_t features); 545 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 546 void br_manage_promisc(struct net_bridge *br); 547 548 /* br_input.c */ 549 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 550 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 551 552 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 553 { 554 return rcu_dereference(dev->rx_handler) == br_handle_frame; 555 } 556 557 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 558 { 559 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 560 } 561 562 /* br_ioctl.c */ 563 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 564 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 565 void __user *arg); 566 567 /* br_multicast.c */ 568 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 569 extern unsigned int br_mdb_rehash_seq; 570 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 571 struct sk_buff *skb, u16 vid); 572 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 573 struct sk_buff *skb, u16 vid); 574 int br_multicast_add_port(struct net_bridge_port *port); 575 void br_multicast_del_port(struct net_bridge_port *port); 576 void br_multicast_enable_port(struct net_bridge_port *port); 577 void br_multicast_disable_port(struct net_bridge_port *port); 578 void br_multicast_init(struct net_bridge *br); 579 void br_multicast_open(struct net_bridge *br); 580 void br_multicast_stop(struct net_bridge *br); 581 void br_multicast_dev_del(struct net_bridge *br); 582 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 583 struct sk_buff *skb, bool local_rcv, bool local_orig); 584 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 585 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 586 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 587 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 588 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 589 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 590 #if IS_ENABLED(CONFIG_IPV6) 591 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 592 #endif 593 struct net_bridge_mdb_entry * 594 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 595 struct net_bridge_mdb_entry * 596 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 597 struct br_ip *group); 598 void br_multicast_free_pg(struct rcu_head *head); 599 struct net_bridge_port_group * 600 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 601 struct net_bridge_port_group __rcu *next, 602 unsigned char flags); 603 void br_mdb_init(void); 604 void br_mdb_uninit(void); 605 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 606 struct br_ip *group, int type, u8 flags); 607 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 608 int type); 609 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 610 const struct sk_buff *skb, u8 type, u8 dir); 611 int br_multicast_init_stats(struct net_bridge *br); 612 void br_multicast_get_stats(const struct net_bridge *br, 613 const struct net_bridge_port *p, 614 struct br_mcast_stats *dest); 615 616 #define mlock_dereference(X, br) \ 617 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 618 619 static inline bool br_multicast_is_router(struct net_bridge *br) 620 { 621 return br->multicast_router == 2 || 622 (br->multicast_router == 1 && 623 timer_pending(&br->multicast_router_timer)); 624 } 625 626 static inline bool 627 __br_multicast_querier_exists(struct net_bridge *br, 628 struct bridge_mcast_other_query *querier, 629 const bool is_ipv6) 630 { 631 bool own_querier_enabled; 632 633 if (br->multicast_querier) { 634 if (is_ipv6 && !br->has_ipv6_addr) 635 own_querier_enabled = false; 636 else 637 own_querier_enabled = true; 638 } else { 639 own_querier_enabled = false; 640 } 641 642 return time_is_before_jiffies(querier->delay_time) && 643 (own_querier_enabled || timer_pending(&querier->timer)); 644 } 645 646 static inline bool br_multicast_querier_exists(struct net_bridge *br, 647 struct ethhdr *eth) 648 { 649 switch (eth->h_proto) { 650 case (htons(ETH_P_IP)): 651 return __br_multicast_querier_exists(br, 652 &br->ip4_other_query, false); 653 #if IS_ENABLED(CONFIG_IPV6) 654 case (htons(ETH_P_IPV6)): 655 return __br_multicast_querier_exists(br, 656 &br->ip6_other_query, true); 657 #endif 658 default: 659 return false; 660 } 661 } 662 663 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 664 { 665 return BR_INPUT_SKB_CB(skb)->igmp; 666 } 667 #else 668 static inline int br_multicast_rcv(struct net_bridge *br, 669 struct net_bridge_port *port, 670 struct sk_buff *skb, 671 u16 vid) 672 { 673 return 0; 674 } 675 676 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 677 struct sk_buff *skb, u16 vid) 678 { 679 return NULL; 680 } 681 682 static inline int br_multicast_add_port(struct net_bridge_port *port) 683 { 684 return 0; 685 } 686 687 static inline void br_multicast_del_port(struct net_bridge_port *port) 688 { 689 } 690 691 static inline void br_multicast_enable_port(struct net_bridge_port *port) 692 { 693 } 694 695 static inline void br_multicast_disable_port(struct net_bridge_port *port) 696 { 697 } 698 699 static inline void br_multicast_init(struct net_bridge *br) 700 { 701 } 702 703 static inline void br_multicast_open(struct net_bridge *br) 704 { 705 } 706 707 static inline void br_multicast_stop(struct net_bridge *br) 708 { 709 } 710 711 static inline void br_multicast_dev_del(struct net_bridge *br) 712 { 713 } 714 715 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 716 struct sk_buff *skb, 717 bool local_rcv, bool local_orig) 718 { 719 } 720 721 static inline bool br_multicast_is_router(struct net_bridge *br) 722 { 723 return 0; 724 } 725 726 static inline bool br_multicast_querier_exists(struct net_bridge *br, 727 struct ethhdr *eth) 728 { 729 return false; 730 } 731 732 static inline void br_mdb_init(void) 733 { 734 } 735 736 static inline void br_mdb_uninit(void) 737 { 738 } 739 740 static inline void br_multicast_count(struct net_bridge *br, 741 const struct net_bridge_port *p, 742 const struct sk_buff *skb, 743 u8 type, u8 dir) 744 { 745 } 746 747 static inline int br_multicast_init_stats(struct net_bridge *br) 748 { 749 return 0; 750 } 751 752 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 753 { 754 return 0; 755 } 756 #endif 757 758 /* br_vlan.c */ 759 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 760 bool br_allowed_ingress(const struct net_bridge *br, 761 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 762 u16 *vid); 763 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 764 const struct sk_buff *skb); 765 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 766 struct sk_buff *br_handle_vlan(struct net_bridge *br, 767 struct net_bridge_vlan_group *vg, 768 struct sk_buff *skb); 769 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 770 int br_vlan_delete(struct net_bridge *br, u16 vid); 771 void br_vlan_flush(struct net_bridge *br); 772 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 773 void br_recalculate_fwd_mask(struct net_bridge *br); 774 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 775 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 776 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 777 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 778 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 779 int br_vlan_init(struct net_bridge *br); 780 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 781 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 782 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 783 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 784 void nbp_vlan_flush(struct net_bridge_port *port); 785 int nbp_vlan_init(struct net_bridge_port *port); 786 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 787 void br_vlan_get_stats(const struct net_bridge_vlan *v, 788 struct br_vlan_stats *stats); 789 790 static inline struct net_bridge_vlan_group *br_vlan_group( 791 const struct net_bridge *br) 792 { 793 return rtnl_dereference(br->vlgrp); 794 } 795 796 static inline struct net_bridge_vlan_group *nbp_vlan_group( 797 const struct net_bridge_port *p) 798 { 799 return rtnl_dereference(p->vlgrp); 800 } 801 802 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 803 const struct net_bridge *br) 804 { 805 return rcu_dereference(br->vlgrp); 806 } 807 808 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 809 const struct net_bridge_port *p) 810 { 811 return rcu_dereference(p->vlgrp); 812 } 813 814 /* Since bridge now depends on 8021Q module, but the time bridge sees the 815 * skb, the vlan tag will always be present if the frame was tagged. 816 */ 817 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 818 { 819 int err = 0; 820 821 if (skb_vlan_tag_present(skb)) { 822 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 823 } else { 824 *vid = 0; 825 err = -EINVAL; 826 } 827 828 return err; 829 } 830 831 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 832 { 833 if (!vg) 834 return 0; 835 836 smp_rmb(); 837 return vg->pvid; 838 } 839 840 static inline int br_vlan_enabled(struct net_bridge *br) 841 { 842 return br->vlan_enabled; 843 } 844 #else 845 static inline bool br_allowed_ingress(const struct net_bridge *br, 846 struct net_bridge_vlan_group *vg, 847 struct sk_buff *skb, 848 u16 *vid) 849 { 850 return true; 851 } 852 853 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 854 const struct sk_buff *skb) 855 { 856 return true; 857 } 858 859 static inline bool br_should_learn(struct net_bridge_port *p, 860 struct sk_buff *skb, u16 *vid) 861 { 862 return true; 863 } 864 865 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 866 struct net_bridge_vlan_group *vg, 867 struct sk_buff *skb) 868 { 869 return skb; 870 } 871 872 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 873 { 874 return -EOPNOTSUPP; 875 } 876 877 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 878 { 879 return -EOPNOTSUPP; 880 } 881 882 static inline void br_vlan_flush(struct net_bridge *br) 883 { 884 } 885 886 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 887 { 888 } 889 890 static inline int br_vlan_init(struct net_bridge *br) 891 { 892 return 0; 893 } 894 895 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 896 { 897 return -EOPNOTSUPP; 898 } 899 900 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 901 { 902 return -EOPNOTSUPP; 903 } 904 905 static inline void nbp_vlan_flush(struct net_bridge_port *port) 906 { 907 } 908 909 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 910 u16 vid) 911 { 912 return NULL; 913 } 914 915 static inline int nbp_vlan_init(struct net_bridge_port *port) 916 { 917 return 0; 918 } 919 920 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 921 { 922 return 0; 923 } 924 925 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 926 { 927 return 0; 928 } 929 930 static inline int br_vlan_enabled(struct net_bridge *br) 931 { 932 return 0; 933 } 934 935 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 936 unsigned long val) 937 { 938 return -EOPNOTSUPP; 939 } 940 941 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 942 u32 filter_mask) 943 { 944 return 0; 945 } 946 947 static inline struct net_bridge_vlan_group *br_vlan_group( 948 const struct net_bridge *br) 949 { 950 return NULL; 951 } 952 953 static inline struct net_bridge_vlan_group *nbp_vlan_group( 954 const struct net_bridge_port *p) 955 { 956 return NULL; 957 } 958 959 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 960 const struct net_bridge *br) 961 { 962 return NULL; 963 } 964 965 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 966 const struct net_bridge_port *p) 967 { 968 return NULL; 969 } 970 971 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 972 struct br_vlan_stats *stats) 973 { 974 } 975 #endif 976 977 struct nf_br_ops { 978 int (*br_dev_xmit_hook)(struct sk_buff *skb); 979 }; 980 extern const struct nf_br_ops __rcu *nf_br_ops; 981 982 /* br_netfilter.c */ 983 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 984 int br_nf_core_init(void); 985 void br_nf_core_fini(void); 986 void br_netfilter_rtable_init(struct net_bridge *); 987 #else 988 static inline int br_nf_core_init(void) { return 0; } 989 static inline void br_nf_core_fini(void) {} 990 #define br_netfilter_rtable_init(x) 991 #endif 992 993 /* br_stp.c */ 994 void br_set_state(struct net_bridge_port *p, unsigned int state); 995 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 996 void br_init_port(struct net_bridge_port *p); 997 void br_become_designated_port(struct net_bridge_port *p); 998 999 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1000 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1001 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1002 int br_set_max_age(struct net_bridge *br, unsigned long x); 1003 int __set_ageing_time(struct net_device *dev, unsigned long t); 1004 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1005 1006 1007 /* br_stp_if.c */ 1008 void br_stp_enable_bridge(struct net_bridge *br); 1009 void br_stp_disable_bridge(struct net_bridge *br); 1010 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1011 void br_stp_enable_port(struct net_bridge_port *p); 1012 void br_stp_disable_port(struct net_bridge_port *p); 1013 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1014 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1015 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1016 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1017 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1018 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1019 1020 /* br_stp_bpdu.c */ 1021 struct stp_proto; 1022 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1023 struct net_device *dev); 1024 1025 /* br_stp_timer.c */ 1026 void br_stp_timer_init(struct net_bridge *br); 1027 void br_stp_port_timer_init(struct net_bridge_port *p); 1028 unsigned long br_timer_value(const struct timer_list *timer); 1029 1030 /* br.c */ 1031 #if IS_ENABLED(CONFIG_ATM_LANE) 1032 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1033 #endif 1034 1035 /* br_netlink.c */ 1036 extern struct rtnl_link_ops br_link_ops; 1037 int br_netlink_init(void); 1038 void br_netlink_fini(void); 1039 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1040 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1041 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1042 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1043 u32 filter_mask, int nlflags); 1044 1045 #ifdef CONFIG_SYSFS 1046 /* br_sysfs_if.c */ 1047 extern const struct sysfs_ops brport_sysfs_ops; 1048 int br_sysfs_addif(struct net_bridge_port *p); 1049 int br_sysfs_renameif(struct net_bridge_port *p); 1050 1051 /* br_sysfs_br.c */ 1052 int br_sysfs_addbr(struct net_device *dev); 1053 void br_sysfs_delbr(struct net_device *dev); 1054 1055 #else 1056 1057 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1058 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1059 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1060 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1061 #endif /* CONFIG_SYSFS */ 1062 1063 /* br_switchdev.c */ 1064 #ifdef CONFIG_NET_SWITCHDEV 1065 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1066 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1067 struct sk_buff *skb); 1068 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1069 const struct sk_buff *skb); 1070 #else 1071 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1072 { 1073 return 0; 1074 } 1075 1076 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1077 struct sk_buff *skb) 1078 { 1079 } 1080 1081 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1082 const struct sk_buff *skb) 1083 { 1084 return true; 1085 } 1086 #endif /* CONFIG_NET_SWITCHDEV */ 1087 1088 #endif 1089