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 struct br_tunnel_info { 95 __be64 tunnel_id; 96 struct metadata_dst *tunnel_dst; 97 }; 98 99 /** 100 * struct net_bridge_vlan - per-vlan entry 101 * 102 * @vnode: rhashtable member 103 * @vid: VLAN id 104 * @flags: bridge vlan flags 105 * @stats: per-cpu VLAN statistics 106 * @br: if MASTER flag set, this points to a bridge struct 107 * @port: if MASTER flag unset, this points to a port struct 108 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 109 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 110 * for this VLAN entry 111 * @vlist: sorted list of VLAN entries 112 * @rcu: used for entry destruction 113 * 114 * This structure is shared between the global per-VLAN entries contained in 115 * the bridge rhashtable and the local per-port per-VLAN entries contained in 116 * the port's rhashtable. The union entries should be interpreted depending on 117 * the entry flags that are set. 118 */ 119 struct net_bridge_vlan { 120 struct rhash_head vnode; 121 struct rhash_head tnode; 122 u16 vid; 123 u16 flags; 124 struct br_vlan_stats __percpu *stats; 125 union { 126 struct net_bridge *br; 127 struct net_bridge_port *port; 128 }; 129 union { 130 atomic_t refcnt; 131 struct net_bridge_vlan *brvlan; 132 }; 133 134 struct br_tunnel_info tinfo; 135 136 struct list_head vlist; 137 138 struct rcu_head rcu; 139 }; 140 141 /** 142 * struct net_bridge_vlan_group 143 * 144 * @vlan_hash: VLAN entry rhashtable 145 * @vlan_list: sorted VLAN entry list 146 * @num_vlans: number of total VLAN entries 147 * @pvid: PVID VLAN id 148 * 149 * IMPORTANT: Be careful when checking if there're VLAN entries using list 150 * primitives because the bridge can have entries in its list which 151 * are just for global context but not for filtering, i.e. they have 152 * the master flag set but not the brentry flag. If you have to check 153 * if there're "real" entries in the bridge please test @num_vlans 154 */ 155 struct net_bridge_vlan_group { 156 struct rhashtable vlan_hash; 157 struct rhashtable tunnel_hash; 158 struct list_head vlan_list; 159 u16 num_vlans; 160 u16 pvid; 161 }; 162 163 struct net_bridge_fdb_entry { 164 struct hlist_node hlist; 165 struct net_bridge_port *dst; 166 167 mac_addr addr; 168 __u16 vlan_id; 169 unsigned char is_local:1, 170 is_static:1, 171 added_by_user:1, 172 added_by_external_learn:1; 173 174 /* write-heavy members should not affect lookups */ 175 unsigned long updated ____cacheline_aligned_in_smp; 176 unsigned long used; 177 178 struct rcu_head rcu; 179 }; 180 181 #define MDB_PG_FLAGS_PERMANENT BIT(0) 182 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 183 184 struct net_bridge_port_group { 185 struct net_bridge_port *port; 186 struct net_bridge_port_group __rcu *next; 187 struct hlist_node mglist; 188 struct rcu_head rcu; 189 struct timer_list timer; 190 struct br_ip addr; 191 unsigned char flags; 192 unsigned char eth_addr[ETH_ALEN]; 193 }; 194 195 struct net_bridge_mdb_entry 196 { 197 struct hlist_node hlist[2]; 198 struct net_bridge *br; 199 struct net_bridge_port_group __rcu *ports; 200 struct rcu_head rcu; 201 struct timer_list timer; 202 struct br_ip addr; 203 bool mglist; 204 }; 205 206 struct net_bridge_mdb_htable 207 { 208 struct hlist_head *mhash; 209 struct rcu_head rcu; 210 struct net_bridge_mdb_htable *old; 211 u32 size; 212 u32 max; 213 u32 secret; 214 u32 ver; 215 }; 216 217 struct net_bridge_port { 218 struct net_bridge *br; 219 struct net_device *dev; 220 struct list_head list; 221 222 unsigned long flags; 223 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 224 struct net_bridge_vlan_group __rcu *vlgrp; 225 #endif 226 227 /* STP */ 228 u8 priority; 229 u8 state; 230 u16 port_no; 231 unsigned char topology_change_ack; 232 unsigned char config_pending; 233 port_id port_id; 234 port_id designated_port; 235 bridge_id designated_root; 236 bridge_id designated_bridge; 237 u32 path_cost; 238 u32 designated_cost; 239 unsigned long designated_age; 240 241 struct timer_list forward_delay_timer; 242 struct timer_list hold_timer; 243 struct timer_list message_age_timer; 244 struct kobject kobj; 245 struct rcu_head rcu; 246 247 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 248 struct bridge_mcast_own_query ip4_own_query; 249 #if IS_ENABLED(CONFIG_IPV6) 250 struct bridge_mcast_own_query ip6_own_query; 251 #endif /* IS_ENABLED(CONFIG_IPV6) */ 252 unsigned char multicast_router; 253 struct bridge_mcast_stats __percpu *mcast_stats; 254 struct timer_list multicast_router_timer; 255 struct hlist_head mglist; 256 struct hlist_node rlist; 257 #endif 258 259 #ifdef CONFIG_SYSFS 260 char sysfs_name[IFNAMSIZ]; 261 #endif 262 263 #ifdef CONFIG_NET_POLL_CONTROLLER 264 struct netpoll *np; 265 #endif 266 #ifdef CONFIG_NET_SWITCHDEV 267 int offload_fwd_mark; 268 #endif 269 }; 270 271 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 272 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 273 274 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 275 276 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 277 { 278 return rcu_dereference(dev->rx_handler_data); 279 } 280 281 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 282 { 283 return br_port_exists(dev) ? 284 rtnl_dereference(dev->rx_handler_data) : NULL; 285 } 286 287 struct net_bridge { 288 spinlock_t lock; 289 spinlock_t hash_lock; 290 struct list_head port_list; 291 struct net_device *dev; 292 struct pcpu_sw_netstats __percpu *stats; 293 /* These fields are accessed on each packet */ 294 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 295 u8 vlan_enabled; 296 u8 vlan_stats_enabled; 297 __be16 vlan_proto; 298 u16 default_pvid; 299 struct net_bridge_vlan_group __rcu *vlgrp; 300 #endif 301 302 struct hlist_head hash[BR_HASH_SIZE]; 303 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 304 union { 305 struct rtable fake_rtable; 306 struct rt6_info fake_rt6_info; 307 }; 308 bool nf_call_iptables; 309 bool nf_call_ip6tables; 310 bool nf_call_arptables; 311 #endif 312 u16 group_fwd_mask; 313 u16 group_fwd_mask_required; 314 315 /* STP */ 316 bridge_id designated_root; 317 bridge_id bridge_id; 318 u32 root_path_cost; 319 unsigned char topology_change; 320 unsigned char topology_change_detected; 321 u16 root_port; 322 unsigned long max_age; 323 unsigned long hello_time; 324 unsigned long forward_delay; 325 unsigned long ageing_time; 326 unsigned long bridge_max_age; 327 unsigned long bridge_hello_time; 328 unsigned long bridge_forward_delay; 329 unsigned long bridge_ageing_time; 330 331 u8 group_addr[ETH_ALEN]; 332 bool group_addr_set; 333 334 enum { 335 BR_NO_STP, /* no spanning tree */ 336 BR_KERNEL_STP, /* old STP in kernel */ 337 BR_USER_STP, /* new RSTP in userspace */ 338 } stp_enabled; 339 340 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 341 unsigned char multicast_router; 342 343 u8 multicast_disabled:1; 344 u8 multicast_querier:1; 345 u8 multicast_query_use_ifaddr:1; 346 u8 has_ipv6_addr:1; 347 u8 multicast_stats_enabled:1; 348 349 u32 hash_elasticity; 350 u32 hash_max; 351 352 u32 multicast_last_member_count; 353 u32 multicast_startup_query_count; 354 355 u8 multicast_igmp_version; 356 357 unsigned long multicast_last_member_interval; 358 unsigned long multicast_membership_interval; 359 unsigned long multicast_querier_interval; 360 unsigned long multicast_query_interval; 361 unsigned long multicast_query_response_interval; 362 unsigned long multicast_startup_query_interval; 363 364 spinlock_t multicast_lock; 365 struct net_bridge_mdb_htable __rcu *mdb; 366 struct hlist_head router_list; 367 368 struct timer_list multicast_router_timer; 369 struct bridge_mcast_other_query ip4_other_query; 370 struct bridge_mcast_own_query ip4_own_query; 371 struct bridge_mcast_querier ip4_querier; 372 struct bridge_mcast_stats __percpu *mcast_stats; 373 #if IS_ENABLED(CONFIG_IPV6) 374 struct bridge_mcast_other_query ip6_other_query; 375 struct bridge_mcast_own_query ip6_own_query; 376 struct bridge_mcast_querier ip6_querier; 377 u8 multicast_mld_version; 378 #endif /* IS_ENABLED(CONFIG_IPV6) */ 379 #endif 380 381 struct timer_list hello_timer; 382 struct timer_list tcn_timer; 383 struct timer_list topology_change_timer; 384 struct delayed_work gc_work; 385 struct kobject *ifobj; 386 u32 auto_cnt; 387 388 #ifdef CONFIG_NET_SWITCHDEV 389 int offload_fwd_mark; 390 #endif 391 }; 392 393 struct br_input_skb_cb { 394 struct net_device *brdev; 395 396 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 397 int igmp; 398 int mrouters_only; 399 #endif 400 401 bool proxyarp_replied; 402 403 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 404 bool vlan_filtered; 405 #endif 406 407 #ifdef CONFIG_NET_SWITCHDEV 408 int offload_fwd_mark; 409 #endif 410 }; 411 412 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 413 414 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 415 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 416 #else 417 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 418 #endif 419 420 #define br_printk(level, br, format, args...) \ 421 printk(level "%s: " format, (br)->dev->name, ##args) 422 423 #define br_err(__br, format, args...) \ 424 br_printk(KERN_ERR, __br, format, ##args) 425 #define br_warn(__br, format, args...) \ 426 br_printk(KERN_WARNING, __br, format, ##args) 427 #define br_notice(__br, format, args...) \ 428 br_printk(KERN_NOTICE, __br, format, ##args) 429 #define br_info(__br, format, args...) \ 430 br_printk(KERN_INFO, __br, format, ##args) 431 432 #define br_debug(br, format, args...) \ 433 pr_debug("%s: " format, (br)->dev->name, ##args) 434 435 /* called under bridge lock */ 436 static inline int br_is_root_bridge(const struct net_bridge *br) 437 { 438 return !memcmp(&br->bridge_id, &br->designated_root, 8); 439 } 440 441 /* check if a VLAN entry is global */ 442 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 443 { 444 return v->flags & BRIDGE_VLAN_INFO_MASTER; 445 } 446 447 /* check if a VLAN entry is used by the bridge */ 448 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 449 { 450 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 451 } 452 453 /* check if we should use the vlan entry, returns false if it's only context */ 454 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 455 { 456 if (br_vlan_is_master(v)) { 457 if (br_vlan_is_brentry(v)) 458 return true; 459 else 460 return false; 461 } 462 463 return true; 464 } 465 466 /* br_device.c */ 467 void br_dev_setup(struct net_device *dev); 468 void br_dev_delete(struct net_device *dev, struct list_head *list); 469 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 470 #ifdef CONFIG_NET_POLL_CONTROLLER 471 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 472 struct sk_buff *skb) 473 { 474 struct netpoll *np = p->np; 475 476 if (np) 477 netpoll_send_skb(np, skb); 478 } 479 480 int br_netpoll_enable(struct net_bridge_port *p); 481 void br_netpoll_disable(struct net_bridge_port *p); 482 #else 483 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 484 struct sk_buff *skb) 485 { 486 } 487 488 static inline int br_netpoll_enable(struct net_bridge_port *p) 489 { 490 return 0; 491 } 492 493 static inline void br_netpoll_disable(struct net_bridge_port *p) 494 { 495 } 496 #endif 497 498 /* br_fdb.c */ 499 int br_fdb_init(void); 500 void br_fdb_fini(void); 501 void br_fdb_flush(struct net_bridge *br); 502 void br_fdb_find_delete_local(struct net_bridge *br, 503 const struct net_bridge_port *p, 504 const unsigned char *addr, u16 vid); 505 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 506 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 507 void br_fdb_cleanup(struct work_struct *work); 508 void br_fdb_delete_by_port(struct net_bridge *br, 509 const struct net_bridge_port *p, u16 vid, int do_all); 510 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 511 const unsigned char *addr, 512 __u16 vid); 513 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 514 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 515 unsigned long off); 516 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 517 const unsigned char *addr, u16 vid); 518 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 519 const unsigned char *addr, u16 vid, bool added_by_user); 520 521 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 522 struct net_device *dev, const unsigned char *addr, u16 vid); 523 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 524 const unsigned char *addr, u16 vid, u16 nlh_flags); 525 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 526 struct net_device *dev, struct net_device *fdev, int *idx); 527 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 528 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 529 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 530 const unsigned char *addr, u16 vid); 531 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 532 const unsigned char *addr, u16 vid); 533 534 static inline bool br_hash_lock_held(struct net_bridge *br) 535 { 536 #ifdef CONFIG_LOCKDEP 537 return lockdep_is_held(&br->hash_lock); 538 #else 539 return true; 540 #endif 541 } 542 543 /* br_forward.c */ 544 enum br_pkt_type { 545 BR_PKT_UNICAST, 546 BR_PKT_MULTICAST, 547 BR_PKT_BROADCAST 548 }; 549 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 550 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 551 bool local_rcv, bool local_orig); 552 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 553 void br_flood(struct net_bridge *br, struct sk_buff *skb, 554 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 555 556 /* br_if.c */ 557 void br_port_carrier_check(struct net_bridge_port *p); 558 int br_add_bridge(struct net *net, const char *name); 559 int br_del_bridge(struct net *net, const char *name); 560 int br_add_if(struct net_bridge *br, struct net_device *dev); 561 int br_del_if(struct net_bridge *br, struct net_device *dev); 562 int br_min_mtu(const struct net_bridge *br); 563 netdev_features_t br_features_recompute(struct net_bridge *br, 564 netdev_features_t features); 565 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 566 void br_manage_promisc(struct net_bridge *br); 567 568 /* br_input.c */ 569 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 570 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 571 572 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 573 { 574 return rcu_dereference(dev->rx_handler) == br_handle_frame; 575 } 576 577 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 578 { 579 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 580 } 581 582 /* br_ioctl.c */ 583 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 584 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 585 void __user *arg); 586 587 /* br_multicast.c */ 588 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 589 extern unsigned int br_mdb_rehash_seq; 590 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 591 struct sk_buff *skb, u16 vid); 592 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 593 struct sk_buff *skb, u16 vid); 594 int br_multicast_add_port(struct net_bridge_port *port); 595 void br_multicast_del_port(struct net_bridge_port *port); 596 void br_multicast_enable_port(struct net_bridge_port *port); 597 void br_multicast_disable_port(struct net_bridge_port *port); 598 void br_multicast_init(struct net_bridge *br); 599 void br_multicast_open(struct net_bridge *br); 600 void br_multicast_stop(struct net_bridge *br); 601 void br_multicast_dev_del(struct net_bridge *br); 602 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 603 struct sk_buff *skb, bool local_rcv, bool local_orig); 604 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 605 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 606 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 607 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 608 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 609 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 610 #if IS_ENABLED(CONFIG_IPV6) 611 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 612 #endif 613 struct net_bridge_mdb_entry * 614 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 615 struct net_bridge_mdb_entry * 616 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 617 struct br_ip *group); 618 void br_multicast_free_pg(struct rcu_head *head); 619 struct net_bridge_port_group * 620 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 621 struct net_bridge_port_group __rcu *next, 622 unsigned char flags, const unsigned char *src); 623 void br_mdb_init(void); 624 void br_mdb_uninit(void); 625 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 626 struct br_ip *group, int type, u8 flags); 627 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 628 int type); 629 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 630 const struct sk_buff *skb, u8 type, u8 dir); 631 int br_multicast_init_stats(struct net_bridge *br); 632 void br_multicast_get_stats(const struct net_bridge *br, 633 const struct net_bridge_port *p, 634 struct br_mcast_stats *dest); 635 636 #define mlock_dereference(X, br) \ 637 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 638 639 static inline bool br_multicast_is_router(struct net_bridge *br) 640 { 641 return br->multicast_router == 2 || 642 (br->multicast_router == 1 && 643 timer_pending(&br->multicast_router_timer)); 644 } 645 646 static inline bool 647 __br_multicast_querier_exists(struct net_bridge *br, 648 struct bridge_mcast_other_query *querier, 649 const bool is_ipv6) 650 { 651 bool own_querier_enabled; 652 653 if (br->multicast_querier) { 654 if (is_ipv6 && !br->has_ipv6_addr) 655 own_querier_enabled = false; 656 else 657 own_querier_enabled = true; 658 } else { 659 own_querier_enabled = false; 660 } 661 662 return time_is_before_jiffies(querier->delay_time) && 663 (own_querier_enabled || timer_pending(&querier->timer)); 664 } 665 666 static inline bool br_multicast_querier_exists(struct net_bridge *br, 667 struct ethhdr *eth) 668 { 669 switch (eth->h_proto) { 670 case (htons(ETH_P_IP)): 671 return __br_multicast_querier_exists(br, 672 &br->ip4_other_query, false); 673 #if IS_ENABLED(CONFIG_IPV6) 674 case (htons(ETH_P_IPV6)): 675 return __br_multicast_querier_exists(br, 676 &br->ip6_other_query, true); 677 #endif 678 default: 679 return false; 680 } 681 } 682 683 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 684 { 685 return BR_INPUT_SKB_CB(skb)->igmp; 686 } 687 #else 688 static inline int br_multicast_rcv(struct net_bridge *br, 689 struct net_bridge_port *port, 690 struct sk_buff *skb, 691 u16 vid) 692 { 693 return 0; 694 } 695 696 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 697 struct sk_buff *skb, u16 vid) 698 { 699 return NULL; 700 } 701 702 static inline int br_multicast_add_port(struct net_bridge_port *port) 703 { 704 return 0; 705 } 706 707 static inline void br_multicast_del_port(struct net_bridge_port *port) 708 { 709 } 710 711 static inline void br_multicast_enable_port(struct net_bridge_port *port) 712 { 713 } 714 715 static inline void br_multicast_disable_port(struct net_bridge_port *port) 716 { 717 } 718 719 static inline void br_multicast_init(struct net_bridge *br) 720 { 721 } 722 723 static inline void br_multicast_open(struct net_bridge *br) 724 { 725 } 726 727 static inline void br_multicast_stop(struct net_bridge *br) 728 { 729 } 730 731 static inline void br_multicast_dev_del(struct net_bridge *br) 732 { 733 } 734 735 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 736 struct sk_buff *skb, 737 bool local_rcv, bool local_orig) 738 { 739 } 740 741 static inline bool br_multicast_is_router(struct net_bridge *br) 742 { 743 return 0; 744 } 745 746 static inline bool br_multicast_querier_exists(struct net_bridge *br, 747 struct ethhdr *eth) 748 { 749 return false; 750 } 751 752 static inline void br_mdb_init(void) 753 { 754 } 755 756 static inline void br_mdb_uninit(void) 757 { 758 } 759 760 static inline void br_multicast_count(struct net_bridge *br, 761 const struct net_bridge_port *p, 762 const struct sk_buff *skb, 763 u8 type, u8 dir) 764 { 765 } 766 767 static inline int br_multicast_init_stats(struct net_bridge *br) 768 { 769 return 0; 770 } 771 772 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 773 { 774 return 0; 775 } 776 #endif 777 778 /* br_vlan.c */ 779 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 780 bool br_allowed_ingress(const struct net_bridge *br, 781 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 782 u16 *vid); 783 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 784 const struct sk_buff *skb); 785 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 786 struct sk_buff *br_handle_vlan(struct net_bridge *br, 787 const struct net_bridge_port *port, 788 struct net_bridge_vlan_group *vg, 789 struct sk_buff *skb); 790 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 791 int br_vlan_delete(struct net_bridge *br, u16 vid); 792 void br_vlan_flush(struct net_bridge *br); 793 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 794 void br_recalculate_fwd_mask(struct net_bridge *br); 795 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 796 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 797 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 798 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 799 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 800 int br_vlan_init(struct net_bridge *br); 801 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 802 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 803 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 804 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 805 void nbp_vlan_flush(struct net_bridge_port *port); 806 int nbp_vlan_init(struct net_bridge_port *port); 807 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 808 void br_vlan_get_stats(const struct net_bridge_vlan *v, 809 struct br_vlan_stats *stats); 810 811 static inline struct net_bridge_vlan_group *br_vlan_group( 812 const struct net_bridge *br) 813 { 814 return rtnl_dereference(br->vlgrp); 815 } 816 817 static inline struct net_bridge_vlan_group *nbp_vlan_group( 818 const struct net_bridge_port *p) 819 { 820 return rtnl_dereference(p->vlgrp); 821 } 822 823 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 824 const struct net_bridge *br) 825 { 826 return rcu_dereference(br->vlgrp); 827 } 828 829 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 830 const struct net_bridge_port *p) 831 { 832 return rcu_dereference(p->vlgrp); 833 } 834 835 /* Since bridge now depends on 8021Q module, but the time bridge sees the 836 * skb, the vlan tag will always be present if the frame was tagged. 837 */ 838 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 839 { 840 int err = 0; 841 842 if (skb_vlan_tag_present(skb)) { 843 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 844 } else { 845 *vid = 0; 846 err = -EINVAL; 847 } 848 849 return err; 850 } 851 852 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 853 { 854 if (!vg) 855 return 0; 856 857 smp_rmb(); 858 return vg->pvid; 859 } 860 861 static inline int br_vlan_enabled(struct net_bridge *br) 862 { 863 return br->vlan_enabled; 864 } 865 #else 866 static inline bool br_allowed_ingress(const struct net_bridge *br, 867 struct net_bridge_vlan_group *vg, 868 struct sk_buff *skb, 869 u16 *vid) 870 { 871 return true; 872 } 873 874 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 875 const struct sk_buff *skb) 876 { 877 return true; 878 } 879 880 static inline bool br_should_learn(struct net_bridge_port *p, 881 struct sk_buff *skb, u16 *vid) 882 { 883 return true; 884 } 885 886 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 887 const struct net_bridge_port *port, 888 struct net_bridge_vlan_group *vg, 889 struct sk_buff *skb) 890 { 891 return skb; 892 } 893 894 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 895 { 896 return -EOPNOTSUPP; 897 } 898 899 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 900 { 901 return -EOPNOTSUPP; 902 } 903 904 static inline void br_vlan_flush(struct net_bridge *br) 905 { 906 } 907 908 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 909 { 910 } 911 912 static inline int br_vlan_init(struct net_bridge *br) 913 { 914 return 0; 915 } 916 917 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 918 { 919 return -EOPNOTSUPP; 920 } 921 922 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 923 { 924 return -EOPNOTSUPP; 925 } 926 927 static inline void nbp_vlan_flush(struct net_bridge_port *port) 928 { 929 } 930 931 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 932 u16 vid) 933 { 934 return NULL; 935 } 936 937 static inline int nbp_vlan_init(struct net_bridge_port *port) 938 { 939 return 0; 940 } 941 942 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 943 { 944 return 0; 945 } 946 947 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 948 { 949 return 0; 950 } 951 952 static inline int br_vlan_enabled(struct net_bridge *br) 953 { 954 return 0; 955 } 956 957 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 958 unsigned long val) 959 { 960 return -EOPNOTSUPP; 961 } 962 963 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 964 u32 filter_mask) 965 { 966 return 0; 967 } 968 969 static inline struct net_bridge_vlan_group *br_vlan_group( 970 const struct net_bridge *br) 971 { 972 return NULL; 973 } 974 975 static inline struct net_bridge_vlan_group *nbp_vlan_group( 976 const struct net_bridge_port *p) 977 { 978 return NULL; 979 } 980 981 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 982 const struct net_bridge *br) 983 { 984 return NULL; 985 } 986 987 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 988 const struct net_bridge_port *p) 989 { 990 return NULL; 991 } 992 993 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 994 struct br_vlan_stats *stats) 995 { 996 } 997 #endif 998 999 struct nf_br_ops { 1000 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1001 }; 1002 extern const struct nf_br_ops __rcu *nf_br_ops; 1003 1004 /* br_netfilter.c */ 1005 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1006 int br_nf_core_init(void); 1007 void br_nf_core_fini(void); 1008 void br_netfilter_rtable_init(struct net_bridge *); 1009 #else 1010 static inline int br_nf_core_init(void) { return 0; } 1011 static inline void br_nf_core_fini(void) {} 1012 #define br_netfilter_rtable_init(x) 1013 #endif 1014 1015 /* br_stp.c */ 1016 void br_set_state(struct net_bridge_port *p, unsigned int state); 1017 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1018 void br_init_port(struct net_bridge_port *p); 1019 void br_become_designated_port(struct net_bridge_port *p); 1020 1021 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1022 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1023 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1024 int br_set_max_age(struct net_bridge *br, unsigned long x); 1025 int __set_ageing_time(struct net_device *dev, unsigned long t); 1026 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1027 1028 1029 /* br_stp_if.c */ 1030 void br_stp_enable_bridge(struct net_bridge *br); 1031 void br_stp_disable_bridge(struct net_bridge *br); 1032 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1033 void br_stp_enable_port(struct net_bridge_port *p); 1034 void br_stp_disable_port(struct net_bridge_port *p); 1035 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1036 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1037 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1038 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1039 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1040 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1041 1042 /* br_stp_bpdu.c */ 1043 struct stp_proto; 1044 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1045 struct net_device *dev); 1046 1047 /* br_stp_timer.c */ 1048 void br_stp_timer_init(struct net_bridge *br); 1049 void br_stp_port_timer_init(struct net_bridge_port *p); 1050 unsigned long br_timer_value(const struct timer_list *timer); 1051 1052 /* br.c */ 1053 #if IS_ENABLED(CONFIG_ATM_LANE) 1054 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1055 #endif 1056 1057 /* br_netlink.c */ 1058 extern struct rtnl_link_ops br_link_ops; 1059 int br_netlink_init(void); 1060 void br_netlink_fini(void); 1061 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1062 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1063 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1064 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1065 u32 filter_mask, int nlflags); 1066 1067 #ifdef CONFIG_SYSFS 1068 /* br_sysfs_if.c */ 1069 extern const struct sysfs_ops brport_sysfs_ops; 1070 int br_sysfs_addif(struct net_bridge_port *p); 1071 int br_sysfs_renameif(struct net_bridge_port *p); 1072 1073 /* br_sysfs_br.c */ 1074 int br_sysfs_addbr(struct net_device *dev); 1075 void br_sysfs_delbr(struct net_device *dev); 1076 1077 #else 1078 1079 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1080 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1081 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1082 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1083 #endif /* CONFIG_SYSFS */ 1084 1085 /* br_switchdev.c */ 1086 #ifdef CONFIG_NET_SWITCHDEV 1087 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1088 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1089 struct sk_buff *skb); 1090 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1091 const struct sk_buff *skb); 1092 #else 1093 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1094 { 1095 return 0; 1096 } 1097 1098 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1099 struct sk_buff *skb) 1100 { 1101 } 1102 1103 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1104 const struct sk_buff *skb) 1105 { 1106 return true; 1107 } 1108 #endif /* CONFIG_NET_SWITCHDEV */ 1109 1110 #endif 1111