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 unsigned char prio[2]; 59 unsigned char addr[ETH_ALEN]; 60 }; 61 62 struct mac_addr { 63 unsigned char addr[ETH_ALEN]; 64 }; 65 66 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 67 /* our own querier */ 68 struct bridge_mcast_own_query { 69 struct timer_list timer; 70 u32 startup_sent; 71 }; 72 73 /* other querier */ 74 struct bridge_mcast_other_query { 75 struct timer_list timer; 76 unsigned long delay_time; 77 }; 78 79 /* selected querier */ 80 struct bridge_mcast_querier { 81 struct br_ip addr; 82 struct net_bridge_port __rcu *port; 83 }; 84 85 /* IGMP/MLD statistics */ 86 struct bridge_mcast_stats { 87 struct br_mcast_stats mstats; 88 struct u64_stats_sync syncp; 89 }; 90 #endif 91 92 struct br_vlan_stats { 93 u64 rx_bytes; 94 u64 rx_packets; 95 u64 tx_bytes; 96 u64 tx_packets; 97 struct u64_stats_sync syncp; 98 }; 99 100 struct br_tunnel_info { 101 __be64 tunnel_id; 102 struct metadata_dst *tunnel_dst; 103 }; 104 105 /** 106 * struct net_bridge_vlan - per-vlan entry 107 * 108 * @vnode: rhashtable member 109 * @vid: VLAN id 110 * @flags: bridge vlan flags 111 * @stats: per-cpu VLAN statistics 112 * @br: if MASTER flag set, this points to a bridge struct 113 * @port: if MASTER flag unset, this points to a port struct 114 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 115 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 116 * for this VLAN entry 117 * @vlist: sorted list of VLAN entries 118 * @rcu: used for entry destruction 119 * 120 * This structure is shared between the global per-VLAN entries contained in 121 * the bridge rhashtable and the local per-port per-VLAN entries contained in 122 * the port's rhashtable. The union entries should be interpreted depending on 123 * the entry flags that are set. 124 */ 125 struct net_bridge_vlan { 126 struct rhash_head vnode; 127 struct rhash_head tnode; 128 u16 vid; 129 u16 flags; 130 struct br_vlan_stats __percpu *stats; 131 union { 132 struct net_bridge *br; 133 struct net_bridge_port *port; 134 }; 135 union { 136 refcount_t refcnt; 137 struct net_bridge_vlan *brvlan; 138 }; 139 140 struct br_tunnel_info tinfo; 141 142 struct list_head vlist; 143 144 struct rcu_head rcu; 145 }; 146 147 /** 148 * struct net_bridge_vlan_group 149 * 150 * @vlan_hash: VLAN entry rhashtable 151 * @vlan_list: sorted VLAN entry list 152 * @num_vlans: number of total VLAN entries 153 * @pvid: PVID VLAN id 154 * 155 * IMPORTANT: Be careful when checking if there're VLAN entries using list 156 * primitives because the bridge can have entries in its list which 157 * are just for global context but not for filtering, i.e. they have 158 * the master flag set but not the brentry flag. If you have to check 159 * if there're "real" entries in the bridge please test @num_vlans 160 */ 161 struct net_bridge_vlan_group { 162 struct rhashtable vlan_hash; 163 struct rhashtable tunnel_hash; 164 struct list_head vlan_list; 165 u16 num_vlans; 166 u16 pvid; 167 }; 168 169 struct net_bridge_fdb_key { 170 mac_addr addr; 171 u16 vlan_id; 172 }; 173 174 struct net_bridge_fdb_entry { 175 struct rhash_head rhnode; 176 struct net_bridge_port *dst; 177 178 struct net_bridge_fdb_key key; 179 struct hlist_node fdb_node; 180 unsigned char is_local:1, 181 is_static:1, 182 is_sticky:1, 183 added_by_user:1, 184 added_by_external_learn:1, 185 offloaded:1; 186 187 /* write-heavy members should not affect lookups */ 188 unsigned long updated ____cacheline_aligned_in_smp; 189 unsigned long used; 190 191 struct rcu_head rcu; 192 }; 193 194 #define MDB_PG_FLAGS_PERMANENT BIT(0) 195 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 196 197 struct net_bridge_port_group { 198 struct net_bridge_port *port; 199 struct net_bridge_port_group __rcu *next; 200 struct hlist_node mglist; 201 struct rcu_head rcu; 202 struct timer_list timer; 203 struct br_ip addr; 204 unsigned char flags; 205 unsigned char eth_addr[ETH_ALEN]; 206 }; 207 208 struct net_bridge_mdb_entry { 209 struct hlist_node hlist[2]; 210 struct net_bridge *br; 211 struct net_bridge_port_group __rcu *ports; 212 struct rcu_head rcu; 213 struct timer_list timer; 214 struct br_ip addr; 215 bool host_joined; 216 }; 217 218 struct net_bridge_mdb_htable { 219 struct hlist_head *mhash; 220 struct rcu_head rcu; 221 struct net_bridge_mdb_htable *old; 222 u32 size; 223 u32 max; 224 u32 secret; 225 u32 ver; 226 }; 227 228 struct net_bridge_port { 229 struct net_bridge *br; 230 struct net_device *dev; 231 struct list_head list; 232 233 unsigned long flags; 234 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 235 struct net_bridge_vlan_group __rcu *vlgrp; 236 #endif 237 struct net_bridge_port __rcu *backup_port; 238 239 /* STP */ 240 u8 priority; 241 u8 state; 242 u16 port_no; 243 unsigned char topology_change_ack; 244 unsigned char config_pending; 245 port_id port_id; 246 port_id designated_port; 247 bridge_id designated_root; 248 bridge_id designated_bridge; 249 u32 path_cost; 250 u32 designated_cost; 251 unsigned long designated_age; 252 253 struct timer_list forward_delay_timer; 254 struct timer_list hold_timer; 255 struct timer_list message_age_timer; 256 struct kobject kobj; 257 struct rcu_head rcu; 258 259 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 260 struct bridge_mcast_own_query ip4_own_query; 261 #if IS_ENABLED(CONFIG_IPV6) 262 struct bridge_mcast_own_query ip6_own_query; 263 #endif /* IS_ENABLED(CONFIG_IPV6) */ 264 unsigned char multicast_router; 265 struct bridge_mcast_stats __percpu *mcast_stats; 266 struct timer_list multicast_router_timer; 267 struct hlist_head mglist; 268 struct hlist_node rlist; 269 #endif 270 271 #ifdef CONFIG_SYSFS 272 char sysfs_name[IFNAMSIZ]; 273 #endif 274 275 #ifdef CONFIG_NET_POLL_CONTROLLER 276 struct netpoll *np; 277 #endif 278 #ifdef CONFIG_NET_SWITCHDEV 279 int offload_fwd_mark; 280 #endif 281 u16 group_fwd_mask; 282 u16 backup_redirected_cnt; 283 }; 284 285 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 286 287 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 288 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 289 290 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 291 292 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 293 { 294 return rcu_dereference(dev->rx_handler_data); 295 } 296 297 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 298 { 299 return br_port_exists(dev) ? 300 rtnl_dereference(dev->rx_handler_data) : NULL; 301 } 302 303 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 304 { 305 return br_port_exists(dev) ? 306 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 307 } 308 309 enum net_bridge_opts { 310 BROPT_VLAN_ENABLED, 311 BROPT_VLAN_STATS_ENABLED, 312 }; 313 314 struct net_bridge { 315 spinlock_t lock; 316 spinlock_t hash_lock; 317 struct list_head port_list; 318 struct net_device *dev; 319 struct pcpu_sw_netstats __percpu *stats; 320 unsigned long options; 321 /* These fields are accessed on each packet */ 322 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 323 __be16 vlan_proto; 324 u16 default_pvid; 325 struct net_bridge_vlan_group __rcu *vlgrp; 326 #endif 327 328 struct rhashtable fdb_hash_tbl; 329 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 330 union { 331 struct rtable fake_rtable; 332 struct rt6_info fake_rt6_info; 333 }; 334 bool nf_call_iptables; 335 bool nf_call_ip6tables; 336 bool nf_call_arptables; 337 #endif 338 u16 group_fwd_mask; 339 u16 group_fwd_mask_required; 340 341 /* STP */ 342 bridge_id designated_root; 343 bridge_id bridge_id; 344 u32 root_path_cost; 345 unsigned char topology_change; 346 unsigned char topology_change_detected; 347 u16 root_port; 348 unsigned long max_age; 349 unsigned long hello_time; 350 unsigned long forward_delay; 351 unsigned long ageing_time; 352 unsigned long bridge_max_age; 353 unsigned long bridge_hello_time; 354 unsigned long bridge_forward_delay; 355 unsigned long bridge_ageing_time; 356 357 u8 group_addr[ETH_ALEN]; 358 bool group_addr_set; 359 360 enum { 361 BR_NO_STP, /* no spanning tree */ 362 BR_KERNEL_STP, /* old STP in kernel */ 363 BR_USER_STP, /* new RSTP in userspace */ 364 } stp_enabled; 365 366 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 367 unsigned char multicast_router; 368 369 u8 multicast_disabled:1; 370 u8 multicast_querier:1; 371 u8 multicast_query_use_ifaddr:1; 372 u8 has_ipv6_addr:1; 373 u8 multicast_stats_enabled:1; 374 375 u32 hash_elasticity; 376 u32 hash_max; 377 378 u32 multicast_last_member_count; 379 u32 multicast_startup_query_count; 380 381 u8 multicast_igmp_version; 382 383 unsigned long multicast_last_member_interval; 384 unsigned long multicast_membership_interval; 385 unsigned long multicast_querier_interval; 386 unsigned long multicast_query_interval; 387 unsigned long multicast_query_response_interval; 388 unsigned long multicast_startup_query_interval; 389 390 spinlock_t multicast_lock; 391 struct net_bridge_mdb_htable __rcu *mdb; 392 struct hlist_head router_list; 393 394 struct timer_list multicast_router_timer; 395 struct bridge_mcast_other_query ip4_other_query; 396 struct bridge_mcast_own_query ip4_own_query; 397 struct bridge_mcast_querier ip4_querier; 398 struct bridge_mcast_stats __percpu *mcast_stats; 399 #if IS_ENABLED(CONFIG_IPV6) 400 struct bridge_mcast_other_query ip6_other_query; 401 struct bridge_mcast_own_query ip6_own_query; 402 struct bridge_mcast_querier ip6_querier; 403 u8 multicast_mld_version; 404 #endif /* IS_ENABLED(CONFIG_IPV6) */ 405 #endif 406 407 struct timer_list hello_timer; 408 struct timer_list tcn_timer; 409 struct timer_list topology_change_timer; 410 struct delayed_work gc_work; 411 struct kobject *ifobj; 412 u32 auto_cnt; 413 414 #ifdef CONFIG_NET_SWITCHDEV 415 int offload_fwd_mark; 416 #endif 417 bool neigh_suppress_enabled; 418 bool mtu_set_by_user; 419 struct hlist_head fdb_list; 420 }; 421 422 struct br_input_skb_cb { 423 struct net_device *brdev; 424 425 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 426 int igmp; 427 int mrouters_only; 428 #endif 429 430 bool proxyarp_replied; 431 bool src_port_isolated; 432 433 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 434 bool vlan_filtered; 435 #endif 436 437 #ifdef CONFIG_NET_SWITCHDEV 438 int offload_fwd_mark; 439 #endif 440 }; 441 442 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 443 444 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 445 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 446 #else 447 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 448 #endif 449 450 #define br_printk(level, br, format, args...) \ 451 printk(level "%s: " format, (br)->dev->name, ##args) 452 453 #define br_err(__br, format, args...) \ 454 br_printk(KERN_ERR, __br, format, ##args) 455 #define br_warn(__br, format, args...) \ 456 br_printk(KERN_WARNING, __br, format, ##args) 457 #define br_notice(__br, format, args...) \ 458 br_printk(KERN_NOTICE, __br, format, ##args) 459 #define br_info(__br, format, args...) \ 460 br_printk(KERN_INFO, __br, format, ##args) 461 462 #define br_debug(br, format, args...) \ 463 pr_debug("%s: " format, (br)->dev->name, ##args) 464 465 /* called under bridge lock */ 466 static inline int br_is_root_bridge(const struct net_bridge *br) 467 { 468 return !memcmp(&br->bridge_id, &br->designated_root, 8); 469 } 470 471 /* check if a VLAN entry is global */ 472 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 473 { 474 return v->flags & BRIDGE_VLAN_INFO_MASTER; 475 } 476 477 /* check if a VLAN entry is used by the bridge */ 478 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 479 { 480 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 481 } 482 483 /* check if we should use the vlan entry, returns false if it's only context */ 484 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 485 { 486 if (br_vlan_is_master(v)) { 487 if (br_vlan_is_brentry(v)) 488 return true; 489 else 490 return false; 491 } 492 493 return true; 494 } 495 496 static inline int br_opt_get(const struct net_bridge *br, 497 enum net_bridge_opts opt) 498 { 499 return test_bit(opt, &br->options); 500 } 501 502 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 503 504 /* br_device.c */ 505 void br_dev_setup(struct net_device *dev); 506 void br_dev_delete(struct net_device *dev, struct list_head *list); 507 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 508 #ifdef CONFIG_NET_POLL_CONTROLLER 509 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 510 struct sk_buff *skb) 511 { 512 struct netpoll *np = p->np; 513 514 if (np) 515 netpoll_send_skb(np, skb); 516 } 517 518 int br_netpoll_enable(struct net_bridge_port *p); 519 void br_netpoll_disable(struct net_bridge_port *p); 520 #else 521 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 522 struct sk_buff *skb) 523 { 524 } 525 526 static inline int br_netpoll_enable(struct net_bridge_port *p) 527 { 528 return 0; 529 } 530 531 static inline void br_netpoll_disable(struct net_bridge_port *p) 532 { 533 } 534 #endif 535 536 /* br_fdb.c */ 537 int br_fdb_init(void); 538 void br_fdb_fini(void); 539 int br_fdb_hash_init(struct net_bridge *br); 540 void br_fdb_hash_fini(struct net_bridge *br); 541 void br_fdb_flush(struct net_bridge *br); 542 void br_fdb_find_delete_local(struct net_bridge *br, 543 const struct net_bridge_port *p, 544 const unsigned char *addr, u16 vid); 545 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 546 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 547 void br_fdb_cleanup(struct work_struct *work); 548 void br_fdb_delete_by_port(struct net_bridge *br, 549 const struct net_bridge_port *p, u16 vid, int do_all); 550 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 551 const unsigned char *addr, 552 __u16 vid); 553 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 554 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 555 unsigned long off); 556 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 557 const unsigned char *addr, u16 vid); 558 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 559 const unsigned char *addr, u16 vid, bool added_by_user); 560 561 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 562 struct net_device *dev, const unsigned char *addr, u16 vid); 563 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 564 const unsigned char *addr, u16 vid, u16 nlh_flags); 565 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 566 struct net_device *dev, struct net_device *fdev, int *idx); 567 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 568 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 569 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 570 const unsigned char *addr, u16 vid, 571 bool swdev_notify); 572 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 573 const unsigned char *addr, u16 vid, 574 bool swdev_notify); 575 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 576 const unsigned char *addr, u16 vid); 577 578 /* br_forward.c */ 579 enum br_pkt_type { 580 BR_PKT_UNICAST, 581 BR_PKT_MULTICAST, 582 BR_PKT_BROADCAST 583 }; 584 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 585 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 586 bool local_rcv, bool local_orig); 587 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 588 void br_flood(struct net_bridge *br, struct sk_buff *skb, 589 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 590 591 /* return true if both source port and dest port are isolated */ 592 static inline bool br_skb_isolated(const struct net_bridge_port *to, 593 const struct sk_buff *skb) 594 { 595 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 596 (to->flags & BR_ISOLATED); 597 } 598 599 /* br_if.c */ 600 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 601 int br_add_bridge(struct net *net, const char *name); 602 int br_del_bridge(struct net *net, const char *name); 603 int br_add_if(struct net_bridge *br, struct net_device *dev, 604 struct netlink_ext_ack *extack); 605 int br_del_if(struct net_bridge *br, struct net_device *dev); 606 void br_mtu_auto_adjust(struct net_bridge *br); 607 netdev_features_t br_features_recompute(struct net_bridge *br, 608 netdev_features_t features); 609 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 610 void br_manage_promisc(struct net_bridge *br); 611 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 612 613 /* br_input.c */ 614 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 615 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 616 617 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 618 { 619 return rcu_dereference(dev->rx_handler) == br_handle_frame; 620 } 621 622 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 623 { 624 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 625 } 626 627 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 628 { 629 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 630 } 631 632 static inline struct net_bridge_port * 633 br_port_get_check_rtnl(const struct net_device *dev) 634 { 635 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 636 } 637 638 /* br_ioctl.c */ 639 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 640 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 641 void __user *arg); 642 643 /* br_multicast.c */ 644 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 645 extern unsigned int br_mdb_rehash_seq; 646 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 647 struct sk_buff *skb, u16 vid); 648 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 649 struct sk_buff *skb, u16 vid); 650 int br_multicast_add_port(struct net_bridge_port *port); 651 void br_multicast_del_port(struct net_bridge_port *port); 652 void br_multicast_enable_port(struct net_bridge_port *port); 653 void br_multicast_disable_port(struct net_bridge_port *port); 654 void br_multicast_init(struct net_bridge *br); 655 void br_multicast_open(struct net_bridge *br); 656 void br_multicast_stop(struct net_bridge *br); 657 void br_multicast_dev_del(struct net_bridge *br); 658 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 659 struct sk_buff *skb, bool local_rcv, bool local_orig); 660 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 661 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 662 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 663 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 664 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 665 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 666 #if IS_ENABLED(CONFIG_IPV6) 667 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 668 #endif 669 struct net_bridge_mdb_entry * 670 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 671 struct net_bridge_mdb_entry * 672 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 673 struct br_ip *group); 674 void br_multicast_free_pg(struct rcu_head *head); 675 struct net_bridge_port_group * 676 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 677 struct net_bridge_port_group __rcu *next, 678 unsigned char flags, const unsigned char *src); 679 void br_mdb_init(void); 680 void br_mdb_uninit(void); 681 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 682 struct br_ip *group, int type, u8 flags); 683 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 684 int type); 685 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 686 const struct sk_buff *skb, u8 type, u8 dir); 687 int br_multicast_init_stats(struct net_bridge *br); 688 void br_multicast_uninit_stats(struct net_bridge *br); 689 void br_multicast_get_stats(const struct net_bridge *br, 690 const struct net_bridge_port *p, 691 struct br_mcast_stats *dest); 692 693 #define mlock_dereference(X, br) \ 694 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 695 696 static inline bool br_multicast_is_router(struct net_bridge *br) 697 { 698 return br->multicast_router == 2 || 699 (br->multicast_router == 1 && 700 timer_pending(&br->multicast_router_timer)); 701 } 702 703 static inline bool 704 __br_multicast_querier_exists(struct net_bridge *br, 705 struct bridge_mcast_other_query *querier, 706 const bool is_ipv6) 707 { 708 bool own_querier_enabled; 709 710 if (br->multicast_querier) { 711 if (is_ipv6 && !br->has_ipv6_addr) 712 own_querier_enabled = false; 713 else 714 own_querier_enabled = true; 715 } else { 716 own_querier_enabled = false; 717 } 718 719 return time_is_before_jiffies(querier->delay_time) && 720 (own_querier_enabled || timer_pending(&querier->timer)); 721 } 722 723 static inline bool br_multicast_querier_exists(struct net_bridge *br, 724 struct ethhdr *eth) 725 { 726 switch (eth->h_proto) { 727 case (htons(ETH_P_IP)): 728 return __br_multicast_querier_exists(br, 729 &br->ip4_other_query, false); 730 #if IS_ENABLED(CONFIG_IPV6) 731 case (htons(ETH_P_IPV6)): 732 return __br_multicast_querier_exists(br, 733 &br->ip6_other_query, true); 734 #endif 735 default: 736 return false; 737 } 738 } 739 740 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 741 { 742 return BR_INPUT_SKB_CB(skb)->igmp; 743 } 744 #else 745 static inline int br_multicast_rcv(struct net_bridge *br, 746 struct net_bridge_port *port, 747 struct sk_buff *skb, 748 u16 vid) 749 { 750 return 0; 751 } 752 753 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 754 struct sk_buff *skb, u16 vid) 755 { 756 return NULL; 757 } 758 759 static inline int br_multicast_add_port(struct net_bridge_port *port) 760 { 761 return 0; 762 } 763 764 static inline void br_multicast_del_port(struct net_bridge_port *port) 765 { 766 } 767 768 static inline void br_multicast_enable_port(struct net_bridge_port *port) 769 { 770 } 771 772 static inline void br_multicast_disable_port(struct net_bridge_port *port) 773 { 774 } 775 776 static inline void br_multicast_init(struct net_bridge *br) 777 { 778 } 779 780 static inline void br_multicast_open(struct net_bridge *br) 781 { 782 } 783 784 static inline void br_multicast_stop(struct net_bridge *br) 785 { 786 } 787 788 static inline void br_multicast_dev_del(struct net_bridge *br) 789 { 790 } 791 792 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 793 struct sk_buff *skb, 794 bool local_rcv, bool local_orig) 795 { 796 } 797 798 static inline bool br_multicast_is_router(struct net_bridge *br) 799 { 800 return false; 801 } 802 803 static inline bool br_multicast_querier_exists(struct net_bridge *br, 804 struct ethhdr *eth) 805 { 806 return false; 807 } 808 809 static inline void br_mdb_init(void) 810 { 811 } 812 813 static inline void br_mdb_uninit(void) 814 { 815 } 816 817 static inline void br_multicast_count(struct net_bridge *br, 818 const struct net_bridge_port *p, 819 const struct sk_buff *skb, 820 u8 type, u8 dir) 821 { 822 } 823 824 static inline int br_multicast_init_stats(struct net_bridge *br) 825 { 826 return 0; 827 } 828 829 static inline void br_multicast_uninit_stats(struct net_bridge *br) 830 { 831 } 832 833 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 834 { 835 return 0; 836 } 837 #endif 838 839 /* br_vlan.c */ 840 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 841 bool br_allowed_ingress(const struct net_bridge *br, 842 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 843 u16 *vid); 844 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 845 const struct sk_buff *skb); 846 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 847 struct sk_buff *br_handle_vlan(struct net_bridge *br, 848 const struct net_bridge_port *port, 849 struct net_bridge_vlan_group *vg, 850 struct sk_buff *skb); 851 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 852 bool *changed); 853 int br_vlan_delete(struct net_bridge *br, u16 vid); 854 void br_vlan_flush(struct net_bridge *br); 855 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 856 void br_recalculate_fwd_mask(struct net_bridge *br); 857 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 858 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 859 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 860 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 861 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 862 int br_vlan_init(struct net_bridge *br); 863 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 864 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 865 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 866 bool *changed); 867 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 868 void nbp_vlan_flush(struct net_bridge_port *port); 869 int nbp_vlan_init(struct net_bridge_port *port); 870 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 871 void br_vlan_get_stats(const struct net_bridge_vlan *v, 872 struct br_vlan_stats *stats); 873 874 static inline struct net_bridge_vlan_group *br_vlan_group( 875 const struct net_bridge *br) 876 { 877 return rtnl_dereference(br->vlgrp); 878 } 879 880 static inline struct net_bridge_vlan_group *nbp_vlan_group( 881 const struct net_bridge_port *p) 882 { 883 return rtnl_dereference(p->vlgrp); 884 } 885 886 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 887 const struct net_bridge *br) 888 { 889 return rcu_dereference(br->vlgrp); 890 } 891 892 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 893 const struct net_bridge_port *p) 894 { 895 return rcu_dereference(p->vlgrp); 896 } 897 898 /* Since bridge now depends on 8021Q module, but the time bridge sees the 899 * skb, the vlan tag will always be present if the frame was tagged. 900 */ 901 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 902 { 903 int err = 0; 904 905 if (skb_vlan_tag_present(skb)) { 906 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 907 } else { 908 *vid = 0; 909 err = -EINVAL; 910 } 911 912 return err; 913 } 914 915 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 916 { 917 if (!vg) 918 return 0; 919 920 smp_rmb(); 921 return vg->pvid; 922 } 923 924 #else 925 static inline bool br_allowed_ingress(const struct net_bridge *br, 926 struct net_bridge_vlan_group *vg, 927 struct sk_buff *skb, 928 u16 *vid) 929 { 930 return true; 931 } 932 933 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 934 const struct sk_buff *skb) 935 { 936 return true; 937 } 938 939 static inline bool br_should_learn(struct net_bridge_port *p, 940 struct sk_buff *skb, u16 *vid) 941 { 942 return true; 943 } 944 945 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 946 const struct net_bridge_port *port, 947 struct net_bridge_vlan_group *vg, 948 struct sk_buff *skb) 949 { 950 return skb; 951 } 952 953 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 954 bool *changed) 955 { 956 *changed = false; 957 return -EOPNOTSUPP; 958 } 959 960 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 961 { 962 return -EOPNOTSUPP; 963 } 964 965 static inline void br_vlan_flush(struct net_bridge *br) 966 { 967 } 968 969 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 970 { 971 } 972 973 static inline int br_vlan_init(struct net_bridge *br) 974 { 975 return 0; 976 } 977 978 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 979 bool *changed) 980 { 981 *changed = false; 982 return -EOPNOTSUPP; 983 } 984 985 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 986 { 987 return -EOPNOTSUPP; 988 } 989 990 static inline void nbp_vlan_flush(struct net_bridge_port *port) 991 { 992 } 993 994 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 995 u16 vid) 996 { 997 return NULL; 998 } 999 1000 static inline int nbp_vlan_init(struct net_bridge_port *port) 1001 { 1002 return 0; 1003 } 1004 1005 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1006 { 1007 return 0; 1008 } 1009 1010 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1011 { 1012 return 0; 1013 } 1014 1015 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1016 unsigned long val) 1017 { 1018 return -EOPNOTSUPP; 1019 } 1020 1021 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1022 u32 filter_mask) 1023 { 1024 return 0; 1025 } 1026 1027 static inline struct net_bridge_vlan_group *br_vlan_group( 1028 const struct net_bridge *br) 1029 { 1030 return NULL; 1031 } 1032 1033 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1034 const struct net_bridge_port *p) 1035 { 1036 return NULL; 1037 } 1038 1039 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1040 const struct net_bridge *br) 1041 { 1042 return NULL; 1043 } 1044 1045 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1046 const struct net_bridge_port *p) 1047 { 1048 return NULL; 1049 } 1050 1051 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1052 struct br_vlan_stats *stats) 1053 { 1054 } 1055 #endif 1056 1057 struct nf_br_ops { 1058 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1059 }; 1060 extern const struct nf_br_ops __rcu *nf_br_ops; 1061 1062 /* br_netfilter.c */ 1063 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1064 int br_nf_core_init(void); 1065 void br_nf_core_fini(void); 1066 void br_netfilter_rtable_init(struct net_bridge *); 1067 #else 1068 static inline int br_nf_core_init(void) { return 0; } 1069 static inline void br_nf_core_fini(void) {} 1070 #define br_netfilter_rtable_init(x) 1071 #endif 1072 1073 /* br_stp.c */ 1074 void br_set_state(struct net_bridge_port *p, unsigned int state); 1075 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1076 void br_init_port(struct net_bridge_port *p); 1077 void br_become_designated_port(struct net_bridge_port *p); 1078 1079 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1080 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1081 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1082 int br_set_max_age(struct net_bridge *br, unsigned long x); 1083 int __set_ageing_time(struct net_device *dev, unsigned long t); 1084 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1085 1086 1087 /* br_stp_if.c */ 1088 void br_stp_enable_bridge(struct net_bridge *br); 1089 void br_stp_disable_bridge(struct net_bridge *br); 1090 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1091 void br_stp_enable_port(struct net_bridge_port *p); 1092 void br_stp_disable_port(struct net_bridge_port *p); 1093 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1094 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1095 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1096 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1097 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1098 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1099 1100 /* br_stp_bpdu.c */ 1101 struct stp_proto; 1102 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1103 struct net_device *dev); 1104 1105 /* br_stp_timer.c */ 1106 void br_stp_timer_init(struct net_bridge *br); 1107 void br_stp_port_timer_init(struct net_bridge_port *p); 1108 unsigned long br_timer_value(const struct timer_list *timer); 1109 1110 /* br.c */ 1111 #if IS_ENABLED(CONFIG_ATM_LANE) 1112 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1113 #endif 1114 1115 /* br_netlink.c */ 1116 extern struct rtnl_link_ops br_link_ops; 1117 int br_netlink_init(void); 1118 void br_netlink_fini(void); 1119 void br_ifinfo_notify(int event, const struct net_bridge *br, 1120 const struct net_bridge_port *port); 1121 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1122 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1123 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1124 u32 filter_mask, int nlflags); 1125 1126 #ifdef CONFIG_SYSFS 1127 /* br_sysfs_if.c */ 1128 extern const struct sysfs_ops brport_sysfs_ops; 1129 int br_sysfs_addif(struct net_bridge_port *p); 1130 int br_sysfs_renameif(struct net_bridge_port *p); 1131 1132 /* br_sysfs_br.c */ 1133 int br_sysfs_addbr(struct net_device *dev); 1134 void br_sysfs_delbr(struct net_device *dev); 1135 1136 #else 1137 1138 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1139 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1140 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1141 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1142 #endif /* CONFIG_SYSFS */ 1143 1144 /* br_switchdev.c */ 1145 #ifdef CONFIG_NET_SWITCHDEV 1146 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1147 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1148 struct sk_buff *skb); 1149 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1150 const struct sk_buff *skb); 1151 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1152 unsigned long flags, 1153 unsigned long mask); 1154 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1155 int type); 1156 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags); 1157 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1158 1159 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1160 { 1161 skb->offload_fwd_mark = 0; 1162 } 1163 #else 1164 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1165 { 1166 return 0; 1167 } 1168 1169 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1170 struct sk_buff *skb) 1171 { 1172 } 1173 1174 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1175 const struct sk_buff *skb) 1176 { 1177 return true; 1178 } 1179 1180 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1181 unsigned long flags, 1182 unsigned long mask) 1183 { 1184 return 0; 1185 } 1186 1187 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1188 u16 vid, u16 flags) 1189 { 1190 return -EOPNOTSUPP; 1191 } 1192 1193 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1194 { 1195 return -EOPNOTSUPP; 1196 } 1197 1198 static inline void 1199 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1200 { 1201 } 1202 1203 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1204 { 1205 } 1206 #endif /* CONFIG_NET_SWITCHDEV */ 1207 1208 /* br_arp_nd_proxy.c */ 1209 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1210 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1211 u16 vid, struct net_bridge_port *p); 1212 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1213 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1214 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1215 #endif 1216