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 #include <linux/refcount.h> 25 26 #define BR_HASH_BITS 8 27 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 28 29 #define BR_HOLD_TIME (1*HZ) 30 31 #define BR_PORT_BITS 10 32 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 33 34 #define BR_VERSION "2.3" 35 36 /* Control of forwarding link local multicast */ 37 #define BR_GROUPFWD_DEFAULT 0 38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 39 enum { 40 BR_GROUPFWD_STP = BIT(0), 41 BR_GROUPFWD_MACPAUSE = BIT(1), 42 BR_GROUPFWD_LACP = BIT(2), 43 }; 44 45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 46 BR_GROUPFWD_LACP) 47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 48 #define BR_GROUPFWD_8021AD 0xB801u 49 50 /* Path to usermode spanning tree program */ 51 #define BR_STP_PROG "/sbin/bridge-stp" 52 53 typedef struct bridge_id bridge_id; 54 typedef struct mac_addr mac_addr; 55 typedef __u16 port_id; 56 57 struct bridge_id 58 { 59 unsigned char prio[2]; 60 unsigned char addr[ETH_ALEN]; 61 }; 62 63 struct mac_addr 64 { 65 unsigned char addr[ETH_ALEN]; 66 }; 67 68 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 69 /* our own querier */ 70 struct bridge_mcast_own_query { 71 struct timer_list timer; 72 u32 startup_sent; 73 }; 74 75 /* other querier */ 76 struct bridge_mcast_other_query { 77 struct timer_list timer; 78 unsigned long delay_time; 79 }; 80 81 /* selected querier */ 82 struct bridge_mcast_querier { 83 struct br_ip addr; 84 struct net_bridge_port __rcu *port; 85 }; 86 87 /* IGMP/MLD statistics */ 88 struct bridge_mcast_stats { 89 struct br_mcast_stats mstats; 90 struct u64_stats_sync syncp; 91 }; 92 #endif 93 94 struct br_vlan_stats { 95 u64 rx_bytes; 96 u64 rx_packets; 97 u64 tx_bytes; 98 u64 tx_packets; 99 struct u64_stats_sync syncp; 100 }; 101 102 struct br_tunnel_info { 103 __be64 tunnel_id; 104 struct metadata_dst *tunnel_dst; 105 }; 106 107 /** 108 * struct net_bridge_vlan - per-vlan entry 109 * 110 * @vnode: rhashtable member 111 * @vid: VLAN id 112 * @flags: bridge vlan flags 113 * @stats: per-cpu VLAN statistics 114 * @br: if MASTER flag set, this points to a bridge struct 115 * @port: if MASTER flag unset, this points to a port struct 116 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 117 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 118 * for this VLAN entry 119 * @vlist: sorted list of VLAN entries 120 * @rcu: used for entry destruction 121 * 122 * This structure is shared between the global per-VLAN entries contained in 123 * the bridge rhashtable and the local per-port per-VLAN entries contained in 124 * the port's rhashtable. The union entries should be interpreted depending on 125 * the entry flags that are set. 126 */ 127 struct net_bridge_vlan { 128 struct rhash_head vnode; 129 struct rhash_head tnode; 130 u16 vid; 131 u16 flags; 132 struct br_vlan_stats __percpu *stats; 133 union { 134 struct net_bridge *br; 135 struct net_bridge_port *port; 136 }; 137 union { 138 refcount_t refcnt; 139 struct net_bridge_vlan *brvlan; 140 }; 141 142 struct br_tunnel_info tinfo; 143 144 struct list_head vlist; 145 146 struct rcu_head rcu; 147 }; 148 149 /** 150 * struct net_bridge_vlan_group 151 * 152 * @vlan_hash: VLAN entry rhashtable 153 * @vlan_list: sorted VLAN entry list 154 * @num_vlans: number of total VLAN entries 155 * @pvid: PVID VLAN id 156 * 157 * IMPORTANT: Be careful when checking if there're VLAN entries using list 158 * primitives because the bridge can have entries in its list which 159 * are just for global context but not for filtering, i.e. they have 160 * the master flag set but not the brentry flag. If you have to check 161 * if there're "real" entries in the bridge please test @num_vlans 162 */ 163 struct net_bridge_vlan_group { 164 struct rhashtable vlan_hash; 165 struct rhashtable tunnel_hash; 166 struct list_head vlan_list; 167 u16 num_vlans; 168 u16 pvid; 169 }; 170 171 struct net_bridge_fdb_entry { 172 struct hlist_node hlist; 173 struct net_bridge_port *dst; 174 175 mac_addr addr; 176 __u16 vlan_id; 177 unsigned char is_local:1, 178 is_static:1, 179 added_by_user:1, 180 added_by_external_learn:1, 181 offloaded:1; 182 183 /* write-heavy members should not affect lookups */ 184 unsigned long updated ____cacheline_aligned_in_smp; 185 unsigned long used; 186 187 struct rcu_head rcu; 188 }; 189 190 #define MDB_PG_FLAGS_PERMANENT BIT(0) 191 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 192 193 struct net_bridge_port_group { 194 struct net_bridge_port *port; 195 struct net_bridge_port_group __rcu *next; 196 struct hlist_node mglist; 197 struct rcu_head rcu; 198 struct timer_list timer; 199 struct br_ip addr; 200 unsigned char flags; 201 unsigned char eth_addr[ETH_ALEN]; 202 }; 203 204 struct net_bridge_mdb_entry 205 { 206 struct hlist_node hlist[2]; 207 struct net_bridge *br; 208 struct net_bridge_port_group __rcu *ports; 209 struct rcu_head rcu; 210 struct timer_list timer; 211 struct br_ip addr; 212 bool mglist; 213 }; 214 215 struct net_bridge_mdb_htable 216 { 217 struct hlist_head *mhash; 218 struct rcu_head rcu; 219 struct net_bridge_mdb_htable *old; 220 u32 size; 221 u32 max; 222 u32 secret; 223 u32 ver; 224 }; 225 226 struct net_bridge_port { 227 struct net_bridge *br; 228 struct net_device *dev; 229 struct list_head list; 230 231 unsigned long flags; 232 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 233 struct net_bridge_vlan_group __rcu *vlgrp; 234 #endif 235 236 /* STP */ 237 u8 priority; 238 u8 state; 239 u16 port_no; 240 unsigned char topology_change_ack; 241 unsigned char config_pending; 242 port_id port_id; 243 port_id designated_port; 244 bridge_id designated_root; 245 bridge_id designated_bridge; 246 u32 path_cost; 247 u32 designated_cost; 248 unsigned long designated_age; 249 250 struct timer_list forward_delay_timer; 251 struct timer_list hold_timer; 252 struct timer_list message_age_timer; 253 struct kobject kobj; 254 struct rcu_head rcu; 255 256 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 257 struct bridge_mcast_own_query ip4_own_query; 258 #if IS_ENABLED(CONFIG_IPV6) 259 struct bridge_mcast_own_query ip6_own_query; 260 #endif /* IS_ENABLED(CONFIG_IPV6) */ 261 unsigned char multicast_router; 262 struct bridge_mcast_stats __percpu *mcast_stats; 263 struct timer_list multicast_router_timer; 264 struct hlist_head mglist; 265 struct hlist_node rlist; 266 #endif 267 268 #ifdef CONFIG_SYSFS 269 char sysfs_name[IFNAMSIZ]; 270 #endif 271 272 #ifdef CONFIG_NET_POLL_CONTROLLER 273 struct netpoll *np; 274 #endif 275 #ifdef CONFIG_NET_SWITCHDEV 276 int offload_fwd_mark; 277 #endif 278 u16 group_fwd_mask; 279 }; 280 281 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 282 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 283 284 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 285 286 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 287 { 288 return rcu_dereference(dev->rx_handler_data); 289 } 290 291 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 292 { 293 return br_port_exists(dev) ? 294 rtnl_dereference(dev->rx_handler_data) : NULL; 295 } 296 297 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 298 { 299 return br_port_exists(dev) ? 300 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 301 } 302 303 struct net_bridge { 304 spinlock_t lock; 305 spinlock_t hash_lock; 306 struct list_head port_list; 307 struct net_device *dev; 308 struct pcpu_sw_netstats __percpu *stats; 309 /* These fields are accessed on each packet */ 310 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 311 u8 vlan_enabled; 312 u8 vlan_stats_enabled; 313 __be16 vlan_proto; 314 u16 default_pvid; 315 struct net_bridge_vlan_group __rcu *vlgrp; 316 #endif 317 318 struct hlist_head hash[BR_HASH_SIZE]; 319 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 320 union { 321 struct rtable fake_rtable; 322 struct rt6_info fake_rt6_info; 323 }; 324 bool nf_call_iptables; 325 bool nf_call_ip6tables; 326 bool nf_call_arptables; 327 #endif 328 u16 group_fwd_mask; 329 u16 group_fwd_mask_required; 330 331 /* STP */ 332 bridge_id designated_root; 333 bridge_id bridge_id; 334 u32 root_path_cost; 335 unsigned char topology_change; 336 unsigned char topology_change_detected; 337 u16 root_port; 338 unsigned long max_age; 339 unsigned long hello_time; 340 unsigned long forward_delay; 341 unsigned long ageing_time; 342 unsigned long bridge_max_age; 343 unsigned long bridge_hello_time; 344 unsigned long bridge_forward_delay; 345 unsigned long bridge_ageing_time; 346 347 u8 group_addr[ETH_ALEN]; 348 bool group_addr_set; 349 350 enum { 351 BR_NO_STP, /* no spanning tree */ 352 BR_KERNEL_STP, /* old STP in kernel */ 353 BR_USER_STP, /* new RSTP in userspace */ 354 } stp_enabled; 355 356 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 357 unsigned char multicast_router; 358 359 u8 multicast_disabled:1; 360 u8 multicast_querier:1; 361 u8 multicast_query_use_ifaddr:1; 362 u8 has_ipv6_addr:1; 363 u8 multicast_stats_enabled:1; 364 365 u32 hash_elasticity; 366 u32 hash_max; 367 368 u32 multicast_last_member_count; 369 u32 multicast_startup_query_count; 370 371 u8 multicast_igmp_version; 372 373 unsigned long multicast_last_member_interval; 374 unsigned long multicast_membership_interval; 375 unsigned long multicast_querier_interval; 376 unsigned long multicast_query_interval; 377 unsigned long multicast_query_response_interval; 378 unsigned long multicast_startup_query_interval; 379 380 spinlock_t multicast_lock; 381 struct net_bridge_mdb_htable __rcu *mdb; 382 struct hlist_head router_list; 383 384 struct timer_list multicast_router_timer; 385 struct bridge_mcast_other_query ip4_other_query; 386 struct bridge_mcast_own_query ip4_own_query; 387 struct bridge_mcast_querier ip4_querier; 388 struct bridge_mcast_stats __percpu *mcast_stats; 389 #if IS_ENABLED(CONFIG_IPV6) 390 struct bridge_mcast_other_query ip6_other_query; 391 struct bridge_mcast_own_query ip6_own_query; 392 struct bridge_mcast_querier ip6_querier; 393 u8 multicast_mld_version; 394 #endif /* IS_ENABLED(CONFIG_IPV6) */ 395 #endif 396 397 struct timer_list hello_timer; 398 struct timer_list tcn_timer; 399 struct timer_list topology_change_timer; 400 struct delayed_work gc_work; 401 struct kobject *ifobj; 402 u32 auto_cnt; 403 404 #ifdef CONFIG_NET_SWITCHDEV 405 int offload_fwd_mark; 406 #endif 407 }; 408 409 struct br_input_skb_cb { 410 struct net_device *brdev; 411 412 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 413 int igmp; 414 int mrouters_only; 415 #endif 416 417 bool proxyarp_replied; 418 419 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 420 bool vlan_filtered; 421 #endif 422 423 #ifdef CONFIG_NET_SWITCHDEV 424 int offload_fwd_mark; 425 #endif 426 }; 427 428 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 429 430 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 431 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 432 #else 433 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 434 #endif 435 436 #define br_printk(level, br, format, args...) \ 437 printk(level "%s: " format, (br)->dev->name, ##args) 438 439 #define br_err(__br, format, args...) \ 440 br_printk(KERN_ERR, __br, format, ##args) 441 #define br_warn(__br, format, args...) \ 442 br_printk(KERN_WARNING, __br, format, ##args) 443 #define br_notice(__br, format, args...) \ 444 br_printk(KERN_NOTICE, __br, format, ##args) 445 #define br_info(__br, format, args...) \ 446 br_printk(KERN_INFO, __br, format, ##args) 447 448 #define br_debug(br, format, args...) \ 449 pr_debug("%s: " format, (br)->dev->name, ##args) 450 451 /* called under bridge lock */ 452 static inline int br_is_root_bridge(const struct net_bridge *br) 453 { 454 return !memcmp(&br->bridge_id, &br->designated_root, 8); 455 } 456 457 /* check if a VLAN entry is global */ 458 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 459 { 460 return v->flags & BRIDGE_VLAN_INFO_MASTER; 461 } 462 463 /* check if a VLAN entry is used by the bridge */ 464 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 465 { 466 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 467 } 468 469 /* check if we should use the vlan entry, returns false if it's only context */ 470 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 471 { 472 if (br_vlan_is_master(v)) { 473 if (br_vlan_is_brentry(v)) 474 return true; 475 else 476 return false; 477 } 478 479 return true; 480 } 481 482 /* br_device.c */ 483 void br_dev_setup(struct net_device *dev); 484 void br_dev_delete(struct net_device *dev, struct list_head *list); 485 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 486 #ifdef CONFIG_NET_POLL_CONTROLLER 487 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 488 struct sk_buff *skb) 489 { 490 struct netpoll *np = p->np; 491 492 if (np) 493 netpoll_send_skb(np, skb); 494 } 495 496 int br_netpoll_enable(struct net_bridge_port *p); 497 void br_netpoll_disable(struct net_bridge_port *p); 498 #else 499 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 500 struct sk_buff *skb) 501 { 502 } 503 504 static inline int br_netpoll_enable(struct net_bridge_port *p) 505 { 506 return 0; 507 } 508 509 static inline void br_netpoll_disable(struct net_bridge_port *p) 510 { 511 } 512 #endif 513 514 /* br_fdb.c */ 515 int br_fdb_init(void); 516 void br_fdb_fini(void); 517 void br_fdb_flush(struct net_bridge *br); 518 void br_fdb_find_delete_local(struct net_bridge *br, 519 const struct net_bridge_port *p, 520 const unsigned char *addr, u16 vid); 521 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 522 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 523 void br_fdb_cleanup(struct work_struct *work); 524 void br_fdb_delete_by_port(struct net_bridge *br, 525 const struct net_bridge_port *p, u16 vid, int do_all); 526 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 527 const unsigned char *addr, 528 __u16 vid); 529 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 530 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 531 unsigned long off); 532 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 533 const unsigned char *addr, u16 vid); 534 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 535 const unsigned char *addr, u16 vid, bool added_by_user); 536 537 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 538 struct net_device *dev, const unsigned char *addr, u16 vid); 539 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 540 const unsigned char *addr, u16 vid, u16 nlh_flags); 541 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 542 struct net_device *dev, struct net_device *fdev, int *idx); 543 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 544 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 545 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 546 const unsigned char *addr, u16 vid); 547 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 548 const unsigned char *addr, u16 vid); 549 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 550 const unsigned char *addr, u16 vid); 551 552 /* br_forward.c */ 553 enum br_pkt_type { 554 BR_PKT_UNICAST, 555 BR_PKT_MULTICAST, 556 BR_PKT_BROADCAST 557 }; 558 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 559 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 560 bool local_rcv, bool local_orig); 561 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 562 void br_flood(struct net_bridge *br, struct sk_buff *skb, 563 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 564 565 /* br_if.c */ 566 void br_port_carrier_check(struct net_bridge_port *p); 567 int br_add_bridge(struct net *net, const char *name); 568 int br_del_bridge(struct net *net, const char *name); 569 int br_add_if(struct net_bridge *br, struct net_device *dev); 570 int br_del_if(struct net_bridge *br, struct net_device *dev); 571 int br_min_mtu(const struct net_bridge *br); 572 netdev_features_t br_features_recompute(struct net_bridge *br, 573 netdev_features_t features); 574 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 575 void br_manage_promisc(struct net_bridge *br); 576 577 /* br_input.c */ 578 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 579 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 580 581 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 582 { 583 return rcu_dereference(dev->rx_handler) == br_handle_frame; 584 } 585 586 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 587 { 588 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 589 } 590 591 /* br_ioctl.c */ 592 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 593 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 594 void __user *arg); 595 596 /* br_multicast.c */ 597 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 598 extern unsigned int br_mdb_rehash_seq; 599 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 600 struct sk_buff *skb, u16 vid); 601 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 602 struct sk_buff *skb, u16 vid); 603 int br_multicast_add_port(struct net_bridge_port *port); 604 void br_multicast_del_port(struct net_bridge_port *port); 605 void br_multicast_enable_port(struct net_bridge_port *port); 606 void br_multicast_disable_port(struct net_bridge_port *port); 607 void br_multicast_init(struct net_bridge *br); 608 void br_multicast_open(struct net_bridge *br); 609 void br_multicast_stop(struct net_bridge *br); 610 void br_multicast_dev_del(struct net_bridge *br); 611 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 612 struct sk_buff *skb, bool local_rcv, bool local_orig); 613 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 614 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 615 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 616 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 617 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 618 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 619 #if IS_ENABLED(CONFIG_IPV6) 620 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 621 #endif 622 struct net_bridge_mdb_entry * 623 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 624 struct net_bridge_mdb_entry * 625 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 626 struct br_ip *group); 627 void br_multicast_free_pg(struct rcu_head *head); 628 struct net_bridge_port_group * 629 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 630 struct net_bridge_port_group __rcu *next, 631 unsigned char flags, const unsigned char *src); 632 void br_mdb_init(void); 633 void br_mdb_uninit(void); 634 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 635 struct br_ip *group, int type, u8 flags); 636 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 637 int type); 638 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 639 const struct sk_buff *skb, u8 type, u8 dir); 640 int br_multicast_init_stats(struct net_bridge *br); 641 void br_multicast_uninit_stats(struct net_bridge *br); 642 void br_multicast_get_stats(const struct net_bridge *br, 643 const struct net_bridge_port *p, 644 struct br_mcast_stats *dest); 645 646 #define mlock_dereference(X, br) \ 647 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 648 649 static inline bool br_multicast_is_router(struct net_bridge *br) 650 { 651 return br->multicast_router == 2 || 652 (br->multicast_router == 1 && 653 timer_pending(&br->multicast_router_timer)); 654 } 655 656 static inline bool 657 __br_multicast_querier_exists(struct net_bridge *br, 658 struct bridge_mcast_other_query *querier, 659 const bool is_ipv6) 660 { 661 bool own_querier_enabled; 662 663 if (br->multicast_querier) { 664 if (is_ipv6 && !br->has_ipv6_addr) 665 own_querier_enabled = false; 666 else 667 own_querier_enabled = true; 668 } else { 669 own_querier_enabled = false; 670 } 671 672 return time_is_before_jiffies(querier->delay_time) && 673 (own_querier_enabled || timer_pending(&querier->timer)); 674 } 675 676 static inline bool br_multicast_querier_exists(struct net_bridge *br, 677 struct ethhdr *eth) 678 { 679 switch (eth->h_proto) { 680 case (htons(ETH_P_IP)): 681 return __br_multicast_querier_exists(br, 682 &br->ip4_other_query, false); 683 #if IS_ENABLED(CONFIG_IPV6) 684 case (htons(ETH_P_IPV6)): 685 return __br_multicast_querier_exists(br, 686 &br->ip6_other_query, true); 687 #endif 688 default: 689 return false; 690 } 691 } 692 693 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 694 { 695 return BR_INPUT_SKB_CB(skb)->igmp; 696 } 697 #else 698 static inline int br_multicast_rcv(struct net_bridge *br, 699 struct net_bridge_port *port, 700 struct sk_buff *skb, 701 u16 vid) 702 { 703 return 0; 704 } 705 706 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 707 struct sk_buff *skb, u16 vid) 708 { 709 return NULL; 710 } 711 712 static inline int br_multicast_add_port(struct net_bridge_port *port) 713 { 714 return 0; 715 } 716 717 static inline void br_multicast_del_port(struct net_bridge_port *port) 718 { 719 } 720 721 static inline void br_multicast_enable_port(struct net_bridge_port *port) 722 { 723 } 724 725 static inline void br_multicast_disable_port(struct net_bridge_port *port) 726 { 727 } 728 729 static inline void br_multicast_init(struct net_bridge *br) 730 { 731 } 732 733 static inline void br_multicast_open(struct net_bridge *br) 734 { 735 } 736 737 static inline void br_multicast_stop(struct net_bridge *br) 738 { 739 } 740 741 static inline void br_multicast_dev_del(struct net_bridge *br) 742 { 743 } 744 745 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 746 struct sk_buff *skb, 747 bool local_rcv, bool local_orig) 748 { 749 } 750 751 static inline bool br_multicast_is_router(struct net_bridge *br) 752 { 753 return 0; 754 } 755 756 static inline bool br_multicast_querier_exists(struct net_bridge *br, 757 struct ethhdr *eth) 758 { 759 return false; 760 } 761 762 static inline void br_mdb_init(void) 763 { 764 } 765 766 static inline void br_mdb_uninit(void) 767 { 768 } 769 770 static inline void br_multicast_count(struct net_bridge *br, 771 const struct net_bridge_port *p, 772 const struct sk_buff *skb, 773 u8 type, u8 dir) 774 { 775 } 776 777 static inline int br_multicast_init_stats(struct net_bridge *br) 778 { 779 return 0; 780 } 781 782 static inline void br_multicast_uninit_stats(struct net_bridge *br) 783 { 784 } 785 786 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 787 { 788 return 0; 789 } 790 #endif 791 792 /* br_vlan.c */ 793 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 794 bool br_allowed_ingress(const struct net_bridge *br, 795 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 796 u16 *vid); 797 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 798 const struct sk_buff *skb); 799 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 800 struct sk_buff *br_handle_vlan(struct net_bridge *br, 801 const struct net_bridge_port *port, 802 struct net_bridge_vlan_group *vg, 803 struct sk_buff *skb); 804 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 805 int br_vlan_delete(struct net_bridge *br, u16 vid); 806 void br_vlan_flush(struct net_bridge *br); 807 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 808 void br_recalculate_fwd_mask(struct net_bridge *br); 809 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 810 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 811 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 812 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 813 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 814 int br_vlan_init(struct net_bridge *br); 815 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 816 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 817 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 818 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 819 void nbp_vlan_flush(struct net_bridge_port *port); 820 int nbp_vlan_init(struct net_bridge_port *port); 821 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 822 void br_vlan_get_stats(const struct net_bridge_vlan *v, 823 struct br_vlan_stats *stats); 824 825 static inline struct net_bridge_vlan_group *br_vlan_group( 826 const struct net_bridge *br) 827 { 828 return rtnl_dereference(br->vlgrp); 829 } 830 831 static inline struct net_bridge_vlan_group *nbp_vlan_group( 832 const struct net_bridge_port *p) 833 { 834 return rtnl_dereference(p->vlgrp); 835 } 836 837 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 838 const struct net_bridge *br) 839 { 840 return rcu_dereference(br->vlgrp); 841 } 842 843 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 844 const struct net_bridge_port *p) 845 { 846 return rcu_dereference(p->vlgrp); 847 } 848 849 /* Since bridge now depends on 8021Q module, but the time bridge sees the 850 * skb, the vlan tag will always be present if the frame was tagged. 851 */ 852 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 853 { 854 int err = 0; 855 856 if (skb_vlan_tag_present(skb)) { 857 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 858 } else { 859 *vid = 0; 860 err = -EINVAL; 861 } 862 863 return err; 864 } 865 866 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 867 { 868 if (!vg) 869 return 0; 870 871 smp_rmb(); 872 return vg->pvid; 873 } 874 875 #else 876 static inline bool br_allowed_ingress(const struct net_bridge *br, 877 struct net_bridge_vlan_group *vg, 878 struct sk_buff *skb, 879 u16 *vid) 880 { 881 return true; 882 } 883 884 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 885 const struct sk_buff *skb) 886 { 887 return true; 888 } 889 890 static inline bool br_should_learn(struct net_bridge_port *p, 891 struct sk_buff *skb, u16 *vid) 892 { 893 return true; 894 } 895 896 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 897 const struct net_bridge_port *port, 898 struct net_bridge_vlan_group *vg, 899 struct sk_buff *skb) 900 { 901 return skb; 902 } 903 904 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 905 { 906 return -EOPNOTSUPP; 907 } 908 909 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 910 { 911 return -EOPNOTSUPP; 912 } 913 914 static inline void br_vlan_flush(struct net_bridge *br) 915 { 916 } 917 918 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 919 { 920 } 921 922 static inline int br_vlan_init(struct net_bridge *br) 923 { 924 return 0; 925 } 926 927 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 928 { 929 return -EOPNOTSUPP; 930 } 931 932 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 933 { 934 return -EOPNOTSUPP; 935 } 936 937 static inline void nbp_vlan_flush(struct net_bridge_port *port) 938 { 939 } 940 941 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 942 u16 vid) 943 { 944 return NULL; 945 } 946 947 static inline int nbp_vlan_init(struct net_bridge_port *port) 948 { 949 return 0; 950 } 951 952 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 953 { 954 return 0; 955 } 956 957 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 958 { 959 return 0; 960 } 961 962 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 963 unsigned long val) 964 { 965 return -EOPNOTSUPP; 966 } 967 968 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 969 u32 filter_mask) 970 { 971 return 0; 972 } 973 974 static inline struct net_bridge_vlan_group *br_vlan_group( 975 const struct net_bridge *br) 976 { 977 return NULL; 978 } 979 980 static inline struct net_bridge_vlan_group *nbp_vlan_group( 981 const struct net_bridge_port *p) 982 { 983 return NULL; 984 } 985 986 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 987 const struct net_bridge *br) 988 { 989 return NULL; 990 } 991 992 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 993 const struct net_bridge_port *p) 994 { 995 return NULL; 996 } 997 998 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 999 struct br_vlan_stats *stats) 1000 { 1001 } 1002 #endif 1003 1004 struct nf_br_ops { 1005 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1006 }; 1007 extern const struct nf_br_ops __rcu *nf_br_ops; 1008 1009 /* br_netfilter.c */ 1010 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1011 int br_nf_core_init(void); 1012 void br_nf_core_fini(void); 1013 void br_netfilter_rtable_init(struct net_bridge *); 1014 #else 1015 static inline int br_nf_core_init(void) { return 0; } 1016 static inline void br_nf_core_fini(void) {} 1017 #define br_netfilter_rtable_init(x) 1018 #endif 1019 1020 /* br_stp.c */ 1021 void br_set_state(struct net_bridge_port *p, unsigned int state); 1022 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1023 void br_init_port(struct net_bridge_port *p); 1024 void br_become_designated_port(struct net_bridge_port *p); 1025 1026 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1027 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1028 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1029 int br_set_max_age(struct net_bridge *br, unsigned long x); 1030 int __set_ageing_time(struct net_device *dev, unsigned long t); 1031 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1032 1033 1034 /* br_stp_if.c */ 1035 void br_stp_enable_bridge(struct net_bridge *br); 1036 void br_stp_disable_bridge(struct net_bridge *br); 1037 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1038 void br_stp_enable_port(struct net_bridge_port *p); 1039 void br_stp_disable_port(struct net_bridge_port *p); 1040 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1041 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1042 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1043 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1044 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1045 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1046 1047 /* br_stp_bpdu.c */ 1048 struct stp_proto; 1049 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1050 struct net_device *dev); 1051 1052 /* br_stp_timer.c */ 1053 void br_stp_timer_init(struct net_bridge *br); 1054 void br_stp_port_timer_init(struct net_bridge_port *p); 1055 unsigned long br_timer_value(const struct timer_list *timer); 1056 1057 /* br.c */ 1058 #if IS_ENABLED(CONFIG_ATM_LANE) 1059 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1060 #endif 1061 1062 /* br_netlink.c */ 1063 extern struct rtnl_link_ops br_link_ops; 1064 int br_netlink_init(void); 1065 void br_netlink_fini(void); 1066 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1067 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1068 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1069 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1070 u32 filter_mask, int nlflags); 1071 1072 #ifdef CONFIG_SYSFS 1073 /* br_sysfs_if.c */ 1074 extern const struct sysfs_ops brport_sysfs_ops; 1075 int br_sysfs_addif(struct net_bridge_port *p); 1076 int br_sysfs_renameif(struct net_bridge_port *p); 1077 1078 /* br_sysfs_br.c */ 1079 int br_sysfs_addbr(struct net_device *dev); 1080 void br_sysfs_delbr(struct net_device *dev); 1081 1082 #else 1083 1084 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1085 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1086 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1087 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1088 #endif /* CONFIG_SYSFS */ 1089 1090 /* br_switchdev.c */ 1091 #ifdef CONFIG_NET_SWITCHDEV 1092 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1093 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1094 struct sk_buff *skb); 1095 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1096 const struct sk_buff *skb); 1097 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1098 unsigned long flags, 1099 unsigned long mask); 1100 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1101 int type); 1102 1103 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1104 { 1105 skb->offload_fwd_mark = 0; 1106 } 1107 #else 1108 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1109 { 1110 return 0; 1111 } 1112 1113 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1114 struct sk_buff *skb) 1115 { 1116 } 1117 1118 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1119 const struct sk_buff *skb) 1120 { 1121 return true; 1122 } 1123 1124 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1125 unsigned long flags, 1126 unsigned long mask) 1127 { 1128 return 0; 1129 } 1130 1131 static inline void 1132 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1133 { 1134 } 1135 1136 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1137 { 1138 } 1139 #endif /* CONFIG_NET_SWITCHDEV */ 1140 1141 #endif 1142