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 bool neigh_suppress_enabled; 408 }; 409 410 struct br_input_skb_cb { 411 struct net_device *brdev; 412 413 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 414 int igmp; 415 int mrouters_only; 416 #endif 417 418 bool proxyarp_replied; 419 420 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 421 bool vlan_filtered; 422 #endif 423 424 #ifdef CONFIG_NET_SWITCHDEV 425 int offload_fwd_mark; 426 #endif 427 }; 428 429 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 430 431 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 432 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 433 #else 434 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 435 #endif 436 437 #define br_printk(level, br, format, args...) \ 438 printk(level "%s: " format, (br)->dev->name, ##args) 439 440 #define br_err(__br, format, args...) \ 441 br_printk(KERN_ERR, __br, format, ##args) 442 #define br_warn(__br, format, args...) \ 443 br_printk(KERN_WARNING, __br, format, ##args) 444 #define br_notice(__br, format, args...) \ 445 br_printk(KERN_NOTICE, __br, format, ##args) 446 #define br_info(__br, format, args...) \ 447 br_printk(KERN_INFO, __br, format, ##args) 448 449 #define br_debug(br, format, args...) \ 450 pr_debug("%s: " format, (br)->dev->name, ##args) 451 452 /* called under bridge lock */ 453 static inline int br_is_root_bridge(const struct net_bridge *br) 454 { 455 return !memcmp(&br->bridge_id, &br->designated_root, 8); 456 } 457 458 /* check if a VLAN entry is global */ 459 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 460 { 461 return v->flags & BRIDGE_VLAN_INFO_MASTER; 462 } 463 464 /* check if a VLAN entry is used by the bridge */ 465 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 466 { 467 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 468 } 469 470 /* check if we should use the vlan entry, returns false if it's only context */ 471 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 472 { 473 if (br_vlan_is_master(v)) { 474 if (br_vlan_is_brentry(v)) 475 return true; 476 else 477 return false; 478 } 479 480 return true; 481 } 482 483 /* br_device.c */ 484 void br_dev_setup(struct net_device *dev); 485 void br_dev_delete(struct net_device *dev, struct list_head *list); 486 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 487 #ifdef CONFIG_NET_POLL_CONTROLLER 488 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 489 struct sk_buff *skb) 490 { 491 struct netpoll *np = p->np; 492 493 if (np) 494 netpoll_send_skb(np, skb); 495 } 496 497 int br_netpoll_enable(struct net_bridge_port *p); 498 void br_netpoll_disable(struct net_bridge_port *p); 499 #else 500 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 501 struct sk_buff *skb) 502 { 503 } 504 505 static inline int br_netpoll_enable(struct net_bridge_port *p) 506 { 507 return 0; 508 } 509 510 static inline void br_netpoll_disable(struct net_bridge_port *p) 511 { 512 } 513 #endif 514 515 /* br_fdb.c */ 516 int br_fdb_init(void); 517 void br_fdb_fini(void); 518 void br_fdb_flush(struct net_bridge *br); 519 void br_fdb_find_delete_local(struct net_bridge *br, 520 const struct net_bridge_port *p, 521 const unsigned char *addr, u16 vid); 522 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 523 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 524 void br_fdb_cleanup(struct work_struct *work); 525 void br_fdb_delete_by_port(struct net_bridge *br, 526 const struct net_bridge_port *p, u16 vid, int do_all); 527 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 528 const unsigned char *addr, 529 __u16 vid); 530 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 531 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 532 unsigned long off); 533 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 534 const unsigned char *addr, u16 vid); 535 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 536 const unsigned char *addr, u16 vid, bool added_by_user); 537 538 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 539 struct net_device *dev, const unsigned char *addr, u16 vid); 540 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 541 const unsigned char *addr, u16 vid, u16 nlh_flags); 542 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 543 struct net_device *dev, struct net_device *fdev, int *idx); 544 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 545 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 546 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 547 const unsigned char *addr, u16 vid); 548 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 549 const unsigned char *addr, u16 vid); 550 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 551 const unsigned char *addr, u16 vid); 552 553 /* br_forward.c */ 554 enum br_pkt_type { 555 BR_PKT_UNICAST, 556 BR_PKT_MULTICAST, 557 BR_PKT_BROADCAST 558 }; 559 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 560 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 561 bool local_rcv, bool local_orig); 562 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 563 void br_flood(struct net_bridge *br, struct sk_buff *skb, 564 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 565 566 /* br_if.c */ 567 void br_port_carrier_check(struct net_bridge_port *p); 568 int br_add_bridge(struct net *net, const char *name); 569 int br_del_bridge(struct net *net, const char *name); 570 int br_add_if(struct net_bridge *br, struct net_device *dev, 571 struct netlink_ext_ack *extack); 572 int br_del_if(struct net_bridge *br, struct net_device *dev); 573 int br_min_mtu(const struct net_bridge *br); 574 netdev_features_t br_features_recompute(struct net_bridge *br, 575 netdev_features_t features); 576 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 577 void br_manage_promisc(struct net_bridge *br); 578 579 /* br_input.c */ 580 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 581 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 582 583 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 584 { 585 return rcu_dereference(dev->rx_handler) == br_handle_frame; 586 } 587 588 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 589 { 590 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 591 } 592 593 /* br_ioctl.c */ 594 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 595 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 596 void __user *arg); 597 598 /* br_multicast.c */ 599 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 600 extern unsigned int br_mdb_rehash_seq; 601 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 602 struct sk_buff *skb, u16 vid); 603 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 604 struct sk_buff *skb, u16 vid); 605 int br_multicast_add_port(struct net_bridge_port *port); 606 void br_multicast_del_port(struct net_bridge_port *port); 607 void br_multicast_enable_port(struct net_bridge_port *port); 608 void br_multicast_disable_port(struct net_bridge_port *port); 609 void br_multicast_init(struct net_bridge *br); 610 void br_multicast_open(struct net_bridge *br); 611 void br_multicast_stop(struct net_bridge *br); 612 void br_multicast_dev_del(struct net_bridge *br); 613 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 614 struct sk_buff *skb, bool local_rcv, bool local_orig); 615 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 616 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 617 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 618 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 619 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 620 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 621 #if IS_ENABLED(CONFIG_IPV6) 622 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 623 #endif 624 struct net_bridge_mdb_entry * 625 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 626 struct net_bridge_mdb_entry * 627 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 628 struct br_ip *group); 629 void br_multicast_free_pg(struct rcu_head *head); 630 struct net_bridge_port_group * 631 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 632 struct net_bridge_port_group __rcu *next, 633 unsigned char flags, const unsigned char *src); 634 void br_mdb_init(void); 635 void br_mdb_uninit(void); 636 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 637 struct br_ip *group, int type, u8 flags); 638 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 639 int type); 640 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 641 const struct sk_buff *skb, u8 type, u8 dir); 642 int br_multicast_init_stats(struct net_bridge *br); 643 void br_multicast_uninit_stats(struct net_bridge *br); 644 void br_multicast_get_stats(const struct net_bridge *br, 645 const struct net_bridge_port *p, 646 struct br_mcast_stats *dest); 647 648 #define mlock_dereference(X, br) \ 649 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 650 651 static inline bool br_multicast_is_router(struct net_bridge *br) 652 { 653 return br->multicast_router == 2 || 654 (br->multicast_router == 1 && 655 timer_pending(&br->multicast_router_timer)); 656 } 657 658 static inline bool 659 __br_multicast_querier_exists(struct net_bridge *br, 660 struct bridge_mcast_other_query *querier, 661 const bool is_ipv6) 662 { 663 bool own_querier_enabled; 664 665 if (br->multicast_querier) { 666 if (is_ipv6 && !br->has_ipv6_addr) 667 own_querier_enabled = false; 668 else 669 own_querier_enabled = true; 670 } else { 671 own_querier_enabled = false; 672 } 673 674 return time_is_before_jiffies(querier->delay_time) && 675 (own_querier_enabled || timer_pending(&querier->timer)); 676 } 677 678 static inline bool br_multicast_querier_exists(struct net_bridge *br, 679 struct ethhdr *eth) 680 { 681 switch (eth->h_proto) { 682 case (htons(ETH_P_IP)): 683 return __br_multicast_querier_exists(br, 684 &br->ip4_other_query, false); 685 #if IS_ENABLED(CONFIG_IPV6) 686 case (htons(ETH_P_IPV6)): 687 return __br_multicast_querier_exists(br, 688 &br->ip6_other_query, true); 689 #endif 690 default: 691 return false; 692 } 693 } 694 695 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 696 { 697 return BR_INPUT_SKB_CB(skb)->igmp; 698 } 699 #else 700 static inline int br_multicast_rcv(struct net_bridge *br, 701 struct net_bridge_port *port, 702 struct sk_buff *skb, 703 u16 vid) 704 { 705 return 0; 706 } 707 708 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 709 struct sk_buff *skb, u16 vid) 710 { 711 return NULL; 712 } 713 714 static inline int br_multicast_add_port(struct net_bridge_port *port) 715 { 716 return 0; 717 } 718 719 static inline void br_multicast_del_port(struct net_bridge_port *port) 720 { 721 } 722 723 static inline void br_multicast_enable_port(struct net_bridge_port *port) 724 { 725 } 726 727 static inline void br_multicast_disable_port(struct net_bridge_port *port) 728 { 729 } 730 731 static inline void br_multicast_init(struct net_bridge *br) 732 { 733 } 734 735 static inline void br_multicast_open(struct net_bridge *br) 736 { 737 } 738 739 static inline void br_multicast_stop(struct net_bridge *br) 740 { 741 } 742 743 static inline void br_multicast_dev_del(struct net_bridge *br) 744 { 745 } 746 747 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 748 struct sk_buff *skb, 749 bool local_rcv, bool local_orig) 750 { 751 } 752 753 static inline bool br_multicast_is_router(struct net_bridge *br) 754 { 755 return 0; 756 } 757 758 static inline bool br_multicast_querier_exists(struct net_bridge *br, 759 struct ethhdr *eth) 760 { 761 return false; 762 } 763 764 static inline void br_mdb_init(void) 765 { 766 } 767 768 static inline void br_mdb_uninit(void) 769 { 770 } 771 772 static inline void br_multicast_count(struct net_bridge *br, 773 const struct net_bridge_port *p, 774 const struct sk_buff *skb, 775 u8 type, u8 dir) 776 { 777 } 778 779 static inline int br_multicast_init_stats(struct net_bridge *br) 780 { 781 return 0; 782 } 783 784 static inline void br_multicast_uninit_stats(struct net_bridge *br) 785 { 786 } 787 788 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 789 { 790 return 0; 791 } 792 #endif 793 794 /* br_vlan.c */ 795 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 796 bool br_allowed_ingress(const struct net_bridge *br, 797 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 798 u16 *vid); 799 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 800 const struct sk_buff *skb); 801 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 802 struct sk_buff *br_handle_vlan(struct net_bridge *br, 803 const struct net_bridge_port *port, 804 struct net_bridge_vlan_group *vg, 805 struct sk_buff *skb); 806 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 807 int br_vlan_delete(struct net_bridge *br, u16 vid); 808 void br_vlan_flush(struct net_bridge *br); 809 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 810 void br_recalculate_fwd_mask(struct net_bridge *br); 811 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 812 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 813 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 814 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 815 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 816 int br_vlan_init(struct net_bridge *br); 817 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 818 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 819 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 820 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 821 void nbp_vlan_flush(struct net_bridge_port *port); 822 int nbp_vlan_init(struct net_bridge_port *port); 823 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 824 void br_vlan_get_stats(const struct net_bridge_vlan *v, 825 struct br_vlan_stats *stats); 826 827 static inline struct net_bridge_vlan_group *br_vlan_group( 828 const struct net_bridge *br) 829 { 830 return rtnl_dereference(br->vlgrp); 831 } 832 833 static inline struct net_bridge_vlan_group *nbp_vlan_group( 834 const struct net_bridge_port *p) 835 { 836 return rtnl_dereference(p->vlgrp); 837 } 838 839 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 840 const struct net_bridge *br) 841 { 842 return rcu_dereference(br->vlgrp); 843 } 844 845 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 846 const struct net_bridge_port *p) 847 { 848 return rcu_dereference(p->vlgrp); 849 } 850 851 /* Since bridge now depends on 8021Q module, but the time bridge sees the 852 * skb, the vlan tag will always be present if the frame was tagged. 853 */ 854 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 855 { 856 int err = 0; 857 858 if (skb_vlan_tag_present(skb)) { 859 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 860 } else { 861 *vid = 0; 862 err = -EINVAL; 863 } 864 865 return err; 866 } 867 868 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 869 { 870 if (!vg) 871 return 0; 872 873 smp_rmb(); 874 return vg->pvid; 875 } 876 877 #else 878 static inline bool br_allowed_ingress(const struct net_bridge *br, 879 struct net_bridge_vlan_group *vg, 880 struct sk_buff *skb, 881 u16 *vid) 882 { 883 return true; 884 } 885 886 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 887 const struct sk_buff *skb) 888 { 889 return true; 890 } 891 892 static inline bool br_should_learn(struct net_bridge_port *p, 893 struct sk_buff *skb, u16 *vid) 894 { 895 return true; 896 } 897 898 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 899 const struct net_bridge_port *port, 900 struct net_bridge_vlan_group *vg, 901 struct sk_buff *skb) 902 { 903 return skb; 904 } 905 906 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 907 { 908 return -EOPNOTSUPP; 909 } 910 911 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 912 { 913 return -EOPNOTSUPP; 914 } 915 916 static inline void br_vlan_flush(struct net_bridge *br) 917 { 918 } 919 920 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 921 { 922 } 923 924 static inline int br_vlan_init(struct net_bridge *br) 925 { 926 return 0; 927 } 928 929 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 930 { 931 return -EOPNOTSUPP; 932 } 933 934 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 935 { 936 return -EOPNOTSUPP; 937 } 938 939 static inline void nbp_vlan_flush(struct net_bridge_port *port) 940 { 941 } 942 943 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 944 u16 vid) 945 { 946 return NULL; 947 } 948 949 static inline int nbp_vlan_init(struct net_bridge_port *port) 950 { 951 return 0; 952 } 953 954 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 955 { 956 return 0; 957 } 958 959 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 960 { 961 return 0; 962 } 963 964 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 965 unsigned long val) 966 { 967 return -EOPNOTSUPP; 968 } 969 970 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 971 u32 filter_mask) 972 { 973 return 0; 974 } 975 976 static inline struct net_bridge_vlan_group *br_vlan_group( 977 const struct net_bridge *br) 978 { 979 return NULL; 980 } 981 982 static inline struct net_bridge_vlan_group *nbp_vlan_group( 983 const struct net_bridge_port *p) 984 { 985 return NULL; 986 } 987 988 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 989 const struct net_bridge *br) 990 { 991 return NULL; 992 } 993 994 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 995 const struct net_bridge_port *p) 996 { 997 return NULL; 998 } 999 1000 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1001 struct br_vlan_stats *stats) 1002 { 1003 } 1004 #endif 1005 1006 struct nf_br_ops { 1007 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1008 }; 1009 extern const struct nf_br_ops __rcu *nf_br_ops; 1010 1011 /* br_netfilter.c */ 1012 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1013 int br_nf_core_init(void); 1014 void br_nf_core_fini(void); 1015 void br_netfilter_rtable_init(struct net_bridge *); 1016 #else 1017 static inline int br_nf_core_init(void) { return 0; } 1018 static inline void br_nf_core_fini(void) {} 1019 #define br_netfilter_rtable_init(x) 1020 #endif 1021 1022 /* br_stp.c */ 1023 void br_set_state(struct net_bridge_port *p, unsigned int state); 1024 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1025 void br_init_port(struct net_bridge_port *p); 1026 void br_become_designated_port(struct net_bridge_port *p); 1027 1028 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1029 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1030 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1031 int br_set_max_age(struct net_bridge *br, unsigned long x); 1032 int __set_ageing_time(struct net_device *dev, unsigned long t); 1033 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1034 1035 1036 /* br_stp_if.c */ 1037 void br_stp_enable_bridge(struct net_bridge *br); 1038 void br_stp_disable_bridge(struct net_bridge *br); 1039 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1040 void br_stp_enable_port(struct net_bridge_port *p); 1041 void br_stp_disable_port(struct net_bridge_port *p); 1042 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1043 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1044 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1045 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1046 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1047 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1048 1049 /* br_stp_bpdu.c */ 1050 struct stp_proto; 1051 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1052 struct net_device *dev); 1053 1054 /* br_stp_timer.c */ 1055 void br_stp_timer_init(struct net_bridge *br); 1056 void br_stp_port_timer_init(struct net_bridge_port *p); 1057 unsigned long br_timer_value(const struct timer_list *timer); 1058 1059 /* br.c */ 1060 #if IS_ENABLED(CONFIG_ATM_LANE) 1061 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1062 #endif 1063 1064 /* br_netlink.c */ 1065 extern struct rtnl_link_ops br_link_ops; 1066 int br_netlink_init(void); 1067 void br_netlink_fini(void); 1068 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1069 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1070 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1071 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1072 u32 filter_mask, int nlflags); 1073 1074 #ifdef CONFIG_SYSFS 1075 /* br_sysfs_if.c */ 1076 extern const struct sysfs_ops brport_sysfs_ops; 1077 int br_sysfs_addif(struct net_bridge_port *p); 1078 int br_sysfs_renameif(struct net_bridge_port *p); 1079 1080 /* br_sysfs_br.c */ 1081 int br_sysfs_addbr(struct net_device *dev); 1082 void br_sysfs_delbr(struct net_device *dev); 1083 1084 #else 1085 1086 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1087 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1088 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1089 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1090 #endif /* CONFIG_SYSFS */ 1091 1092 /* br_switchdev.c */ 1093 #ifdef CONFIG_NET_SWITCHDEV 1094 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1095 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1096 struct sk_buff *skb); 1097 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1098 const struct sk_buff *skb); 1099 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1100 unsigned long flags, 1101 unsigned long mask); 1102 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1103 int type); 1104 1105 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1106 { 1107 skb->offload_fwd_mark = 0; 1108 } 1109 #else 1110 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1111 { 1112 return 0; 1113 } 1114 1115 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1116 struct sk_buff *skb) 1117 { 1118 } 1119 1120 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1121 const struct sk_buff *skb) 1122 { 1123 return true; 1124 } 1125 1126 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1127 unsigned long flags, 1128 unsigned long mask) 1129 { 1130 return 0; 1131 } 1132 1133 static inline void 1134 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1135 { 1136 } 1137 1138 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1139 { 1140 } 1141 #endif /* CONFIG_NET_SWITCHDEV */ 1142 1143 /* br_arp_nd_proxy.c */ 1144 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1145 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1146 u16 vid, struct net_bridge_port *p); 1147 #endif 1148