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_key { 172 mac_addr addr; 173 u16 vlan_id; 174 }; 175 176 struct net_bridge_fdb_entry { 177 struct rhash_head rhnode; 178 struct net_bridge_port *dst; 179 180 struct net_bridge_fdb_key key; 181 struct hlist_node fdb_node; 182 unsigned char is_local:1, 183 is_static:1, 184 added_by_user:1, 185 added_by_external_learn:1, 186 offloaded:1; 187 188 /* write-heavy members should not affect lookups */ 189 unsigned long updated ____cacheline_aligned_in_smp; 190 unsigned long used; 191 192 struct rcu_head rcu; 193 }; 194 195 #define MDB_PG_FLAGS_PERMANENT BIT(0) 196 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 197 198 struct net_bridge_port_group { 199 struct net_bridge_port *port; 200 struct net_bridge_port_group __rcu *next; 201 struct hlist_node mglist; 202 struct rcu_head rcu; 203 struct timer_list timer; 204 struct br_ip addr; 205 unsigned char flags; 206 unsigned char eth_addr[ETH_ALEN]; 207 }; 208 209 struct net_bridge_mdb_entry 210 { 211 struct hlist_node hlist[2]; 212 struct net_bridge *br; 213 struct net_bridge_port_group __rcu *ports; 214 struct rcu_head rcu; 215 struct timer_list timer; 216 struct br_ip addr; 217 bool host_joined; 218 }; 219 220 struct net_bridge_mdb_htable 221 { 222 struct hlist_head *mhash; 223 struct rcu_head rcu; 224 struct net_bridge_mdb_htable *old; 225 u32 size; 226 u32 max; 227 u32 secret; 228 u32 ver; 229 }; 230 231 struct net_bridge_port { 232 struct net_bridge *br; 233 struct net_device *dev; 234 struct list_head list; 235 236 unsigned long flags; 237 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 238 struct net_bridge_vlan_group __rcu *vlgrp; 239 #endif 240 241 /* STP */ 242 u8 priority; 243 u8 state; 244 u16 port_no; 245 unsigned char topology_change_ack; 246 unsigned char config_pending; 247 port_id port_id; 248 port_id designated_port; 249 bridge_id designated_root; 250 bridge_id designated_bridge; 251 u32 path_cost; 252 u32 designated_cost; 253 unsigned long designated_age; 254 255 struct timer_list forward_delay_timer; 256 struct timer_list hold_timer; 257 struct timer_list message_age_timer; 258 struct kobject kobj; 259 struct rcu_head rcu; 260 261 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 262 struct bridge_mcast_own_query ip4_own_query; 263 #if IS_ENABLED(CONFIG_IPV6) 264 struct bridge_mcast_own_query ip6_own_query; 265 #endif /* IS_ENABLED(CONFIG_IPV6) */ 266 unsigned char multicast_router; 267 struct bridge_mcast_stats __percpu *mcast_stats; 268 struct timer_list multicast_router_timer; 269 struct hlist_head mglist; 270 struct hlist_node rlist; 271 #endif 272 273 #ifdef CONFIG_SYSFS 274 char sysfs_name[IFNAMSIZ]; 275 #endif 276 277 #ifdef CONFIG_NET_POLL_CONTROLLER 278 struct netpoll *np; 279 #endif 280 #ifdef CONFIG_NET_SWITCHDEV 281 int offload_fwd_mark; 282 #endif 283 u16 group_fwd_mask; 284 }; 285 286 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 287 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 288 289 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 290 291 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 292 { 293 return rcu_dereference(dev->rx_handler_data); 294 } 295 296 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 297 { 298 return br_port_exists(dev) ? 299 rtnl_dereference(dev->rx_handler_data) : NULL; 300 } 301 302 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 303 { 304 return br_port_exists(dev) ? 305 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 306 } 307 308 struct net_bridge { 309 spinlock_t lock; 310 spinlock_t hash_lock; 311 struct list_head port_list; 312 struct net_device *dev; 313 struct pcpu_sw_netstats __percpu *stats; 314 /* These fields are accessed on each packet */ 315 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 316 u8 vlan_enabled; 317 u8 vlan_stats_enabled; 318 __be16 vlan_proto; 319 u16 default_pvid; 320 struct net_bridge_vlan_group __rcu *vlgrp; 321 #endif 322 323 struct rhashtable fdb_hash_tbl; 324 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 325 union { 326 struct rtable fake_rtable; 327 struct rt6_info fake_rt6_info; 328 }; 329 bool nf_call_iptables; 330 bool nf_call_ip6tables; 331 bool nf_call_arptables; 332 #endif 333 u16 group_fwd_mask; 334 u16 group_fwd_mask_required; 335 336 /* STP */ 337 bridge_id designated_root; 338 bridge_id bridge_id; 339 u32 root_path_cost; 340 unsigned char topology_change; 341 unsigned char topology_change_detected; 342 u16 root_port; 343 unsigned long max_age; 344 unsigned long hello_time; 345 unsigned long forward_delay; 346 unsigned long ageing_time; 347 unsigned long bridge_max_age; 348 unsigned long bridge_hello_time; 349 unsigned long bridge_forward_delay; 350 unsigned long bridge_ageing_time; 351 352 u8 group_addr[ETH_ALEN]; 353 bool group_addr_set; 354 355 enum { 356 BR_NO_STP, /* no spanning tree */ 357 BR_KERNEL_STP, /* old STP in kernel */ 358 BR_USER_STP, /* new RSTP in userspace */ 359 } stp_enabled; 360 361 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 362 unsigned char multicast_router; 363 364 u8 multicast_disabled:1; 365 u8 multicast_querier:1; 366 u8 multicast_query_use_ifaddr:1; 367 u8 has_ipv6_addr:1; 368 u8 multicast_stats_enabled:1; 369 370 u32 hash_elasticity; 371 u32 hash_max; 372 373 u32 multicast_last_member_count; 374 u32 multicast_startup_query_count; 375 376 u8 multicast_igmp_version; 377 378 unsigned long multicast_last_member_interval; 379 unsigned long multicast_membership_interval; 380 unsigned long multicast_querier_interval; 381 unsigned long multicast_query_interval; 382 unsigned long multicast_query_response_interval; 383 unsigned long multicast_startup_query_interval; 384 385 spinlock_t multicast_lock; 386 struct net_bridge_mdb_htable __rcu *mdb; 387 struct hlist_head router_list; 388 389 struct timer_list multicast_router_timer; 390 struct bridge_mcast_other_query ip4_other_query; 391 struct bridge_mcast_own_query ip4_own_query; 392 struct bridge_mcast_querier ip4_querier; 393 struct bridge_mcast_stats __percpu *mcast_stats; 394 #if IS_ENABLED(CONFIG_IPV6) 395 struct bridge_mcast_other_query ip6_other_query; 396 struct bridge_mcast_own_query ip6_own_query; 397 struct bridge_mcast_querier ip6_querier; 398 u8 multicast_mld_version; 399 #endif /* IS_ENABLED(CONFIG_IPV6) */ 400 #endif 401 402 struct timer_list hello_timer; 403 struct timer_list tcn_timer; 404 struct timer_list topology_change_timer; 405 struct delayed_work gc_work; 406 struct kobject *ifobj; 407 u32 auto_cnt; 408 409 #ifdef CONFIG_NET_SWITCHDEV 410 int offload_fwd_mark; 411 #endif 412 bool neigh_suppress_enabled; 413 struct hlist_head fdb_list; 414 }; 415 416 struct br_input_skb_cb { 417 struct net_device *brdev; 418 419 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 420 int igmp; 421 int mrouters_only; 422 #endif 423 424 bool proxyarp_replied; 425 426 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 427 bool vlan_filtered; 428 #endif 429 430 #ifdef CONFIG_NET_SWITCHDEV 431 int offload_fwd_mark; 432 #endif 433 }; 434 435 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 436 437 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 438 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 439 #else 440 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 441 #endif 442 443 #define br_printk(level, br, format, args...) \ 444 printk(level "%s: " format, (br)->dev->name, ##args) 445 446 #define br_err(__br, format, args...) \ 447 br_printk(KERN_ERR, __br, format, ##args) 448 #define br_warn(__br, format, args...) \ 449 br_printk(KERN_WARNING, __br, format, ##args) 450 #define br_notice(__br, format, args...) \ 451 br_printk(KERN_NOTICE, __br, format, ##args) 452 #define br_info(__br, format, args...) \ 453 br_printk(KERN_INFO, __br, format, ##args) 454 455 #define br_debug(br, format, args...) \ 456 pr_debug("%s: " format, (br)->dev->name, ##args) 457 458 /* called under bridge lock */ 459 static inline int br_is_root_bridge(const struct net_bridge *br) 460 { 461 return !memcmp(&br->bridge_id, &br->designated_root, 8); 462 } 463 464 /* check if a VLAN entry is global */ 465 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 466 { 467 return v->flags & BRIDGE_VLAN_INFO_MASTER; 468 } 469 470 /* check if a VLAN entry is used by the bridge */ 471 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 472 { 473 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 474 } 475 476 /* check if we should use the vlan entry, returns false if it's only context */ 477 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 478 { 479 if (br_vlan_is_master(v)) { 480 if (br_vlan_is_brentry(v)) 481 return true; 482 else 483 return false; 484 } 485 486 return true; 487 } 488 489 /* br_device.c */ 490 void br_dev_setup(struct net_device *dev); 491 void br_dev_delete(struct net_device *dev, struct list_head *list); 492 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 493 #ifdef CONFIG_NET_POLL_CONTROLLER 494 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 495 struct sk_buff *skb) 496 { 497 struct netpoll *np = p->np; 498 499 if (np) 500 netpoll_send_skb(np, skb); 501 } 502 503 int br_netpoll_enable(struct net_bridge_port *p); 504 void br_netpoll_disable(struct net_bridge_port *p); 505 #else 506 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 507 struct sk_buff *skb) 508 { 509 } 510 511 static inline int br_netpoll_enable(struct net_bridge_port *p) 512 { 513 return 0; 514 } 515 516 static inline void br_netpoll_disable(struct net_bridge_port *p) 517 { 518 } 519 #endif 520 521 /* br_fdb.c */ 522 int br_fdb_init(void); 523 void br_fdb_fini(void); 524 int br_fdb_hash_init(struct net_bridge *br); 525 void br_fdb_hash_fini(struct net_bridge *br); 526 void br_fdb_flush(struct net_bridge *br); 527 void br_fdb_find_delete_local(struct net_bridge *br, 528 const struct net_bridge_port *p, 529 const unsigned char *addr, u16 vid); 530 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 531 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 532 void br_fdb_cleanup(struct work_struct *work); 533 void br_fdb_delete_by_port(struct net_bridge *br, 534 const struct net_bridge_port *p, u16 vid, int do_all); 535 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 536 const unsigned char *addr, 537 __u16 vid); 538 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 539 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 540 unsigned long off); 541 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 542 const unsigned char *addr, u16 vid); 543 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 544 const unsigned char *addr, u16 vid, bool added_by_user); 545 546 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 547 struct net_device *dev, const unsigned char *addr, u16 vid); 548 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 549 const unsigned char *addr, u16 vid, u16 nlh_flags); 550 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 551 struct net_device *dev, struct net_device *fdev, int *idx); 552 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 553 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 554 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 555 const unsigned char *addr, u16 vid); 556 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 557 const unsigned char *addr, u16 vid); 558 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 559 const unsigned char *addr, u16 vid); 560 561 /* br_forward.c */ 562 enum br_pkt_type { 563 BR_PKT_UNICAST, 564 BR_PKT_MULTICAST, 565 BR_PKT_BROADCAST 566 }; 567 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 568 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 569 bool local_rcv, bool local_orig); 570 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 571 void br_flood(struct net_bridge *br, struct sk_buff *skb, 572 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 573 574 /* br_if.c */ 575 void br_port_carrier_check(struct net_bridge_port *p); 576 int br_add_bridge(struct net *net, const char *name); 577 int br_del_bridge(struct net *net, const char *name); 578 int br_add_if(struct net_bridge *br, struct net_device *dev, 579 struct netlink_ext_ack *extack); 580 int br_del_if(struct net_bridge *br, struct net_device *dev); 581 int br_min_mtu(const struct net_bridge *br); 582 netdev_features_t br_features_recompute(struct net_bridge *br, 583 netdev_features_t features); 584 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 585 void br_manage_promisc(struct net_bridge *br); 586 587 /* br_input.c */ 588 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 589 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 590 591 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 592 { 593 return rcu_dereference(dev->rx_handler) == br_handle_frame; 594 } 595 596 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 597 { 598 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 599 } 600 601 /* br_ioctl.c */ 602 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 603 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 604 void __user *arg); 605 606 /* br_multicast.c */ 607 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 608 extern unsigned int br_mdb_rehash_seq; 609 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 610 struct sk_buff *skb, u16 vid); 611 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 612 struct sk_buff *skb, u16 vid); 613 int br_multicast_add_port(struct net_bridge_port *port); 614 void br_multicast_del_port(struct net_bridge_port *port); 615 void br_multicast_enable_port(struct net_bridge_port *port); 616 void br_multicast_disable_port(struct net_bridge_port *port); 617 void br_multicast_init(struct net_bridge *br); 618 void br_multicast_open(struct net_bridge *br); 619 void br_multicast_stop(struct net_bridge *br); 620 void br_multicast_dev_del(struct net_bridge *br); 621 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 622 struct sk_buff *skb, bool local_rcv, bool local_orig); 623 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 624 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 625 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 626 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 627 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 628 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 629 #if IS_ENABLED(CONFIG_IPV6) 630 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 631 #endif 632 struct net_bridge_mdb_entry * 633 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 634 struct net_bridge_mdb_entry * 635 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 636 struct br_ip *group); 637 void br_multicast_free_pg(struct rcu_head *head); 638 struct net_bridge_port_group * 639 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 640 struct net_bridge_port_group __rcu *next, 641 unsigned char flags, const unsigned char *src); 642 void br_mdb_init(void); 643 void br_mdb_uninit(void); 644 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 645 struct br_ip *group, int type, u8 flags); 646 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 647 int type); 648 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 649 const struct sk_buff *skb, u8 type, u8 dir); 650 int br_multicast_init_stats(struct net_bridge *br); 651 void br_multicast_uninit_stats(struct net_bridge *br); 652 void br_multicast_get_stats(const struct net_bridge *br, 653 const struct net_bridge_port *p, 654 struct br_mcast_stats *dest); 655 656 #define mlock_dereference(X, br) \ 657 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 658 659 static inline bool br_multicast_is_router(struct net_bridge *br) 660 { 661 return br->multicast_router == 2 || 662 (br->multicast_router == 1 && 663 timer_pending(&br->multicast_router_timer)); 664 } 665 666 static inline bool 667 __br_multicast_querier_exists(struct net_bridge *br, 668 struct bridge_mcast_other_query *querier, 669 const bool is_ipv6) 670 { 671 bool own_querier_enabled; 672 673 if (br->multicast_querier) { 674 if (is_ipv6 && !br->has_ipv6_addr) 675 own_querier_enabled = false; 676 else 677 own_querier_enabled = true; 678 } else { 679 own_querier_enabled = false; 680 } 681 682 return time_is_before_jiffies(querier->delay_time) && 683 (own_querier_enabled || timer_pending(&querier->timer)); 684 } 685 686 static inline bool br_multicast_querier_exists(struct net_bridge *br, 687 struct ethhdr *eth) 688 { 689 switch (eth->h_proto) { 690 case (htons(ETH_P_IP)): 691 return __br_multicast_querier_exists(br, 692 &br->ip4_other_query, false); 693 #if IS_ENABLED(CONFIG_IPV6) 694 case (htons(ETH_P_IPV6)): 695 return __br_multicast_querier_exists(br, 696 &br->ip6_other_query, true); 697 #endif 698 default: 699 return false; 700 } 701 } 702 703 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 704 { 705 return BR_INPUT_SKB_CB(skb)->igmp; 706 } 707 #else 708 static inline int br_multicast_rcv(struct net_bridge *br, 709 struct net_bridge_port *port, 710 struct sk_buff *skb, 711 u16 vid) 712 { 713 return 0; 714 } 715 716 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 717 struct sk_buff *skb, u16 vid) 718 { 719 return NULL; 720 } 721 722 static inline int br_multicast_add_port(struct net_bridge_port *port) 723 { 724 return 0; 725 } 726 727 static inline void br_multicast_del_port(struct net_bridge_port *port) 728 { 729 } 730 731 static inline void br_multicast_enable_port(struct net_bridge_port *port) 732 { 733 } 734 735 static inline void br_multicast_disable_port(struct net_bridge_port *port) 736 { 737 } 738 739 static inline void br_multicast_init(struct net_bridge *br) 740 { 741 } 742 743 static inline void br_multicast_open(struct net_bridge *br) 744 { 745 } 746 747 static inline void br_multicast_stop(struct net_bridge *br) 748 { 749 } 750 751 static inline void br_multicast_dev_del(struct net_bridge *br) 752 { 753 } 754 755 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 756 struct sk_buff *skb, 757 bool local_rcv, bool local_orig) 758 { 759 } 760 761 static inline bool br_multicast_is_router(struct net_bridge *br) 762 { 763 return false; 764 } 765 766 static inline bool br_multicast_querier_exists(struct net_bridge *br, 767 struct ethhdr *eth) 768 { 769 return false; 770 } 771 772 static inline void br_mdb_init(void) 773 { 774 } 775 776 static inline void br_mdb_uninit(void) 777 { 778 } 779 780 static inline void br_multicast_count(struct net_bridge *br, 781 const struct net_bridge_port *p, 782 const struct sk_buff *skb, 783 u8 type, u8 dir) 784 { 785 } 786 787 static inline int br_multicast_init_stats(struct net_bridge *br) 788 { 789 return 0; 790 } 791 792 static inline void br_multicast_uninit_stats(struct net_bridge *br) 793 { 794 } 795 796 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 797 { 798 return 0; 799 } 800 #endif 801 802 /* br_vlan.c */ 803 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 804 bool br_allowed_ingress(const struct net_bridge *br, 805 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 806 u16 *vid); 807 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 808 const struct sk_buff *skb); 809 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 810 struct sk_buff *br_handle_vlan(struct net_bridge *br, 811 const struct net_bridge_port *port, 812 struct net_bridge_vlan_group *vg, 813 struct sk_buff *skb); 814 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 815 bool *changed); 816 int br_vlan_delete(struct net_bridge *br, u16 vid); 817 void br_vlan_flush(struct net_bridge *br); 818 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 819 void br_recalculate_fwd_mask(struct net_bridge *br); 820 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 821 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 822 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 823 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 824 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 825 int br_vlan_init(struct net_bridge *br); 826 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 827 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 828 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 829 bool *changed); 830 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 831 void nbp_vlan_flush(struct net_bridge_port *port); 832 int nbp_vlan_init(struct net_bridge_port *port); 833 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 834 void br_vlan_get_stats(const struct net_bridge_vlan *v, 835 struct br_vlan_stats *stats); 836 837 static inline struct net_bridge_vlan_group *br_vlan_group( 838 const struct net_bridge *br) 839 { 840 return rtnl_dereference(br->vlgrp); 841 } 842 843 static inline struct net_bridge_vlan_group *nbp_vlan_group( 844 const struct net_bridge_port *p) 845 { 846 return rtnl_dereference(p->vlgrp); 847 } 848 849 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 850 const struct net_bridge *br) 851 { 852 return rcu_dereference(br->vlgrp); 853 } 854 855 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 856 const struct net_bridge_port *p) 857 { 858 return rcu_dereference(p->vlgrp); 859 } 860 861 /* Since bridge now depends on 8021Q module, but the time bridge sees the 862 * skb, the vlan tag will always be present if the frame was tagged. 863 */ 864 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 865 { 866 int err = 0; 867 868 if (skb_vlan_tag_present(skb)) { 869 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 870 } else { 871 *vid = 0; 872 err = -EINVAL; 873 } 874 875 return err; 876 } 877 878 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 879 { 880 if (!vg) 881 return 0; 882 883 smp_rmb(); 884 return vg->pvid; 885 } 886 887 #else 888 static inline bool br_allowed_ingress(const struct net_bridge *br, 889 struct net_bridge_vlan_group *vg, 890 struct sk_buff *skb, 891 u16 *vid) 892 { 893 return true; 894 } 895 896 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 897 const struct sk_buff *skb) 898 { 899 return true; 900 } 901 902 static inline bool br_should_learn(struct net_bridge_port *p, 903 struct sk_buff *skb, u16 *vid) 904 { 905 return true; 906 } 907 908 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 909 const struct net_bridge_port *port, 910 struct net_bridge_vlan_group *vg, 911 struct sk_buff *skb) 912 { 913 return skb; 914 } 915 916 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 917 bool *changed) 918 { 919 *changed = false; 920 return -EOPNOTSUPP; 921 } 922 923 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 924 { 925 return -EOPNOTSUPP; 926 } 927 928 static inline void br_vlan_flush(struct net_bridge *br) 929 { 930 } 931 932 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 933 { 934 } 935 936 static inline int br_vlan_init(struct net_bridge *br) 937 { 938 return 0; 939 } 940 941 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 942 bool *changed) 943 { 944 *changed = false; 945 return -EOPNOTSUPP; 946 } 947 948 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 949 { 950 return -EOPNOTSUPP; 951 } 952 953 static inline void nbp_vlan_flush(struct net_bridge_port *port) 954 { 955 } 956 957 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 958 u16 vid) 959 { 960 return NULL; 961 } 962 963 static inline int nbp_vlan_init(struct net_bridge_port *port) 964 { 965 return 0; 966 } 967 968 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 969 { 970 return 0; 971 } 972 973 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 974 { 975 return 0; 976 } 977 978 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 979 unsigned long val) 980 { 981 return -EOPNOTSUPP; 982 } 983 984 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 985 u32 filter_mask) 986 { 987 return 0; 988 } 989 990 static inline struct net_bridge_vlan_group *br_vlan_group( 991 const struct net_bridge *br) 992 { 993 return NULL; 994 } 995 996 static inline struct net_bridge_vlan_group *nbp_vlan_group( 997 const struct net_bridge_port *p) 998 { 999 return NULL; 1000 } 1001 1002 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1003 const struct net_bridge *br) 1004 { 1005 return NULL; 1006 } 1007 1008 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1009 const struct net_bridge_port *p) 1010 { 1011 return NULL; 1012 } 1013 1014 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1015 struct br_vlan_stats *stats) 1016 { 1017 } 1018 #endif 1019 1020 struct nf_br_ops { 1021 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1022 }; 1023 extern const struct nf_br_ops __rcu *nf_br_ops; 1024 1025 /* br_netfilter.c */ 1026 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1027 int br_nf_core_init(void); 1028 void br_nf_core_fini(void); 1029 void br_netfilter_rtable_init(struct net_bridge *); 1030 #else 1031 static inline int br_nf_core_init(void) { return 0; } 1032 static inline void br_nf_core_fini(void) {} 1033 #define br_netfilter_rtable_init(x) 1034 #endif 1035 1036 /* br_stp.c */ 1037 void br_set_state(struct net_bridge_port *p, unsigned int state); 1038 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1039 void br_init_port(struct net_bridge_port *p); 1040 void br_become_designated_port(struct net_bridge_port *p); 1041 1042 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1043 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1044 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1045 int br_set_max_age(struct net_bridge *br, unsigned long x); 1046 int __set_ageing_time(struct net_device *dev, unsigned long t); 1047 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1048 1049 1050 /* br_stp_if.c */ 1051 void br_stp_enable_bridge(struct net_bridge *br); 1052 void br_stp_disable_bridge(struct net_bridge *br); 1053 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1054 void br_stp_enable_port(struct net_bridge_port *p); 1055 void br_stp_disable_port(struct net_bridge_port *p); 1056 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1057 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1058 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1059 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1060 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1061 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1062 1063 /* br_stp_bpdu.c */ 1064 struct stp_proto; 1065 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1066 struct net_device *dev); 1067 1068 /* br_stp_timer.c */ 1069 void br_stp_timer_init(struct net_bridge *br); 1070 void br_stp_port_timer_init(struct net_bridge_port *p); 1071 unsigned long br_timer_value(const struct timer_list *timer); 1072 1073 /* br.c */ 1074 #if IS_ENABLED(CONFIG_ATM_LANE) 1075 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1076 #endif 1077 1078 /* br_netlink.c */ 1079 extern struct rtnl_link_ops br_link_ops; 1080 int br_netlink_init(void); 1081 void br_netlink_fini(void); 1082 void br_ifinfo_notify(int event, const struct net_bridge *br, 1083 const struct net_bridge_port *port); 1084 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1085 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1086 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1087 u32 filter_mask, int nlflags); 1088 1089 #ifdef CONFIG_SYSFS 1090 /* br_sysfs_if.c */ 1091 extern const struct sysfs_ops brport_sysfs_ops; 1092 int br_sysfs_addif(struct net_bridge_port *p); 1093 int br_sysfs_renameif(struct net_bridge_port *p); 1094 1095 /* br_sysfs_br.c */ 1096 int br_sysfs_addbr(struct net_device *dev); 1097 void br_sysfs_delbr(struct net_device *dev); 1098 1099 #else 1100 1101 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1102 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1103 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1104 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1105 #endif /* CONFIG_SYSFS */ 1106 1107 /* br_switchdev.c */ 1108 #ifdef CONFIG_NET_SWITCHDEV 1109 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1110 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1111 struct sk_buff *skb); 1112 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1113 const struct sk_buff *skb); 1114 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1115 unsigned long flags, 1116 unsigned long mask); 1117 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1118 int type); 1119 1120 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1121 { 1122 skb->offload_fwd_mark = 0; 1123 } 1124 #else 1125 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1126 { 1127 return 0; 1128 } 1129 1130 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1131 struct sk_buff *skb) 1132 { 1133 } 1134 1135 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1136 const struct sk_buff *skb) 1137 { 1138 return true; 1139 } 1140 1141 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1142 unsigned long flags, 1143 unsigned long mask) 1144 { 1145 return 0; 1146 } 1147 1148 static inline void 1149 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1150 { 1151 } 1152 1153 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1154 { 1155 } 1156 #endif /* CONFIG_NET_SWITCHDEV */ 1157 1158 /* br_arp_nd_proxy.c */ 1159 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1160 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1161 u16 vid, struct net_bridge_port *p); 1162 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1163 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1164 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1165 #endif 1166