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 /* private vlan flags */ 106 enum { 107 BR_VLFLAG_PER_PORT_STATS = BIT(0), 108 }; 109 110 /** 111 * struct net_bridge_vlan - per-vlan entry 112 * 113 * @vnode: rhashtable member 114 * @vid: VLAN id 115 * @flags: bridge vlan flags 116 * @priv_flags: private (in-kernel) bridge vlan flags 117 * @stats: per-cpu VLAN statistics 118 * @br: if MASTER flag set, this points to a bridge struct 119 * @port: if MASTER flag unset, this points to a port struct 120 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 121 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 122 * for this VLAN entry 123 * @vlist: sorted list of VLAN entries 124 * @rcu: used for entry destruction 125 * 126 * This structure is shared between the global per-VLAN entries contained in 127 * the bridge rhashtable and the local per-port per-VLAN entries contained in 128 * the port's rhashtable. The union entries should be interpreted depending on 129 * the entry flags that are set. 130 */ 131 struct net_bridge_vlan { 132 struct rhash_head vnode; 133 struct rhash_head tnode; 134 u16 vid; 135 u16 flags; 136 u16 priv_flags; 137 struct br_vlan_stats __percpu *stats; 138 union { 139 struct net_bridge *br; 140 struct net_bridge_port *port; 141 }; 142 union { 143 refcount_t refcnt; 144 struct net_bridge_vlan *brvlan; 145 }; 146 147 struct br_tunnel_info tinfo; 148 149 struct list_head vlist; 150 151 struct rcu_head rcu; 152 }; 153 154 /** 155 * struct net_bridge_vlan_group 156 * 157 * @vlan_hash: VLAN entry rhashtable 158 * @vlan_list: sorted VLAN entry list 159 * @num_vlans: number of total VLAN entries 160 * @pvid: PVID VLAN id 161 * 162 * IMPORTANT: Be careful when checking if there're VLAN entries using list 163 * primitives because the bridge can have entries in its list which 164 * are just for global context but not for filtering, i.e. they have 165 * the master flag set but not the brentry flag. If you have to check 166 * if there're "real" entries in the bridge please test @num_vlans 167 */ 168 struct net_bridge_vlan_group { 169 struct rhashtable vlan_hash; 170 struct rhashtable tunnel_hash; 171 struct list_head vlan_list; 172 u16 num_vlans; 173 u16 pvid; 174 }; 175 176 struct net_bridge_fdb_key { 177 mac_addr addr; 178 u16 vlan_id; 179 }; 180 181 struct net_bridge_fdb_entry { 182 struct rhash_head rhnode; 183 struct net_bridge_port *dst; 184 185 struct net_bridge_fdb_key key; 186 struct hlist_node fdb_node; 187 unsigned char is_local:1, 188 is_static:1, 189 is_sticky:1, 190 added_by_user:1, 191 added_by_external_learn:1, 192 offloaded:1; 193 194 /* write-heavy members should not affect lookups */ 195 unsigned long updated ____cacheline_aligned_in_smp; 196 unsigned long used; 197 198 struct rcu_head rcu; 199 }; 200 201 #define MDB_PG_FLAGS_PERMANENT BIT(0) 202 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 203 204 struct net_bridge_port_group { 205 struct net_bridge_port *port; 206 struct net_bridge_port_group __rcu *next; 207 struct hlist_node mglist; 208 struct rcu_head rcu; 209 struct timer_list timer; 210 struct br_ip addr; 211 unsigned char flags; 212 unsigned char eth_addr[ETH_ALEN]; 213 }; 214 215 struct net_bridge_mdb_entry { 216 struct hlist_node hlist[2]; 217 struct net_bridge *br; 218 struct net_bridge_port_group __rcu *ports; 219 struct rcu_head rcu; 220 struct timer_list timer; 221 struct br_ip addr; 222 bool host_joined; 223 }; 224 225 struct net_bridge_mdb_htable { 226 struct hlist_head *mhash; 227 struct rcu_head rcu; 228 struct net_bridge_mdb_htable *old; 229 u32 size; 230 u32 max; 231 u32 secret; 232 u32 ver; 233 }; 234 235 struct net_bridge_port { 236 struct net_bridge *br; 237 struct net_device *dev; 238 struct list_head list; 239 240 unsigned long flags; 241 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 242 struct net_bridge_vlan_group __rcu *vlgrp; 243 #endif 244 struct net_bridge_port __rcu *backup_port; 245 246 /* STP */ 247 u8 priority; 248 u8 state; 249 u16 port_no; 250 unsigned char topology_change_ack; 251 unsigned char config_pending; 252 port_id port_id; 253 port_id designated_port; 254 bridge_id designated_root; 255 bridge_id designated_bridge; 256 u32 path_cost; 257 u32 designated_cost; 258 unsigned long designated_age; 259 260 struct timer_list forward_delay_timer; 261 struct timer_list hold_timer; 262 struct timer_list message_age_timer; 263 struct kobject kobj; 264 struct rcu_head rcu; 265 266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 267 struct bridge_mcast_own_query ip4_own_query; 268 #if IS_ENABLED(CONFIG_IPV6) 269 struct bridge_mcast_own_query ip6_own_query; 270 #endif /* IS_ENABLED(CONFIG_IPV6) */ 271 unsigned char multicast_router; 272 struct bridge_mcast_stats __percpu *mcast_stats; 273 struct timer_list multicast_router_timer; 274 struct hlist_head mglist; 275 struct hlist_node rlist; 276 #endif 277 278 #ifdef CONFIG_SYSFS 279 char sysfs_name[IFNAMSIZ]; 280 #endif 281 282 #ifdef CONFIG_NET_POLL_CONTROLLER 283 struct netpoll *np; 284 #endif 285 #ifdef CONFIG_NET_SWITCHDEV 286 int offload_fwd_mark; 287 #endif 288 u16 group_fwd_mask; 289 u16 backup_redirected_cnt; 290 }; 291 292 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 293 294 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 295 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 296 297 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 298 299 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 300 { 301 return rcu_dereference(dev->rx_handler_data); 302 } 303 304 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 305 { 306 return br_port_exists(dev) ? 307 rtnl_dereference(dev->rx_handler_data) : NULL; 308 } 309 310 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 311 { 312 return br_port_exists(dev) ? 313 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 314 } 315 316 enum net_bridge_opts { 317 BROPT_VLAN_ENABLED, 318 BROPT_VLAN_STATS_ENABLED, 319 BROPT_NF_CALL_IPTABLES, 320 BROPT_NF_CALL_IP6TABLES, 321 BROPT_NF_CALL_ARPTABLES, 322 BROPT_GROUP_ADDR_SET, 323 BROPT_MULTICAST_ENABLED, 324 BROPT_MULTICAST_QUERIER, 325 BROPT_MULTICAST_QUERY_USE_IFADDR, 326 BROPT_MULTICAST_STATS_ENABLED, 327 BROPT_HAS_IPV6_ADDR, 328 BROPT_NEIGH_SUPPRESS_ENABLED, 329 BROPT_MTU_SET_BY_USER, 330 BROPT_VLAN_STATS_PER_PORT, 331 }; 332 333 struct net_bridge { 334 spinlock_t lock; 335 spinlock_t hash_lock; 336 struct list_head port_list; 337 struct net_device *dev; 338 struct pcpu_sw_netstats __percpu *stats; 339 unsigned long options; 340 /* These fields are accessed on each packet */ 341 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 342 __be16 vlan_proto; 343 u16 default_pvid; 344 struct net_bridge_vlan_group __rcu *vlgrp; 345 #endif 346 347 struct rhashtable fdb_hash_tbl; 348 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 349 union { 350 struct rtable fake_rtable; 351 struct rt6_info fake_rt6_info; 352 }; 353 #endif 354 u16 group_fwd_mask; 355 u16 group_fwd_mask_required; 356 357 /* STP */ 358 bridge_id designated_root; 359 bridge_id bridge_id; 360 unsigned char topology_change; 361 unsigned char topology_change_detected; 362 u16 root_port; 363 unsigned long max_age; 364 unsigned long hello_time; 365 unsigned long forward_delay; 366 unsigned long ageing_time; 367 unsigned long bridge_max_age; 368 unsigned long bridge_hello_time; 369 unsigned long bridge_forward_delay; 370 unsigned long bridge_ageing_time; 371 u32 root_path_cost; 372 373 u8 group_addr[ETH_ALEN]; 374 375 enum { 376 BR_NO_STP, /* no spanning tree */ 377 BR_KERNEL_STP, /* old STP in kernel */ 378 BR_USER_STP, /* new RSTP in userspace */ 379 } stp_enabled; 380 381 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 382 383 u32 hash_elasticity; 384 u32 hash_max; 385 386 u32 multicast_last_member_count; 387 u32 multicast_startup_query_count; 388 389 u8 multicast_igmp_version; 390 u8 multicast_router; 391 #if IS_ENABLED(CONFIG_IPV6) 392 u8 multicast_mld_version; 393 #endif 394 spinlock_t multicast_lock; 395 unsigned long multicast_last_member_interval; 396 unsigned long multicast_membership_interval; 397 unsigned long multicast_querier_interval; 398 unsigned long multicast_query_interval; 399 unsigned long multicast_query_response_interval; 400 unsigned long multicast_startup_query_interval; 401 402 struct net_bridge_mdb_htable __rcu *mdb; 403 struct hlist_head router_list; 404 405 struct timer_list multicast_router_timer; 406 struct bridge_mcast_other_query ip4_other_query; 407 struct bridge_mcast_own_query ip4_own_query; 408 struct bridge_mcast_querier ip4_querier; 409 struct bridge_mcast_stats __percpu *mcast_stats; 410 #if IS_ENABLED(CONFIG_IPV6) 411 struct bridge_mcast_other_query ip6_other_query; 412 struct bridge_mcast_own_query ip6_own_query; 413 struct bridge_mcast_querier ip6_querier; 414 #endif /* IS_ENABLED(CONFIG_IPV6) */ 415 #endif 416 417 struct timer_list hello_timer; 418 struct timer_list tcn_timer; 419 struct timer_list topology_change_timer; 420 struct delayed_work gc_work; 421 struct kobject *ifobj; 422 u32 auto_cnt; 423 424 #ifdef CONFIG_NET_SWITCHDEV 425 int offload_fwd_mark; 426 #endif 427 struct hlist_head fdb_list; 428 }; 429 430 struct br_input_skb_cb { 431 struct net_device *brdev; 432 433 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 434 int igmp; 435 int mrouters_only; 436 #endif 437 438 bool proxyarp_replied; 439 bool src_port_isolated; 440 441 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 442 bool vlan_filtered; 443 #endif 444 445 #ifdef CONFIG_NET_SWITCHDEV 446 int offload_fwd_mark; 447 #endif 448 }; 449 450 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 451 452 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 453 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 454 #else 455 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 456 #endif 457 458 #define br_printk(level, br, format, args...) \ 459 printk(level "%s: " format, (br)->dev->name, ##args) 460 461 #define br_err(__br, format, args...) \ 462 br_printk(KERN_ERR, __br, format, ##args) 463 #define br_warn(__br, format, args...) \ 464 br_printk(KERN_WARNING, __br, format, ##args) 465 #define br_notice(__br, format, args...) \ 466 br_printk(KERN_NOTICE, __br, format, ##args) 467 #define br_info(__br, format, args...) \ 468 br_printk(KERN_INFO, __br, format, ##args) 469 470 #define br_debug(br, format, args...) \ 471 pr_debug("%s: " format, (br)->dev->name, ##args) 472 473 /* called under bridge lock */ 474 static inline int br_is_root_bridge(const struct net_bridge *br) 475 { 476 return !memcmp(&br->bridge_id, &br->designated_root, 8); 477 } 478 479 /* check if a VLAN entry is global */ 480 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 481 { 482 return v->flags & BRIDGE_VLAN_INFO_MASTER; 483 } 484 485 /* check if a VLAN entry is used by the bridge */ 486 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 487 { 488 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 489 } 490 491 /* check if we should use the vlan entry, returns false if it's only context */ 492 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 493 { 494 if (br_vlan_is_master(v)) { 495 if (br_vlan_is_brentry(v)) 496 return true; 497 else 498 return false; 499 } 500 501 return true; 502 } 503 504 static inline int br_opt_get(const struct net_bridge *br, 505 enum net_bridge_opts opt) 506 { 507 return test_bit(opt, &br->options); 508 } 509 510 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 511 512 /* br_device.c */ 513 void br_dev_setup(struct net_device *dev); 514 void br_dev_delete(struct net_device *dev, struct list_head *list); 515 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 516 #ifdef CONFIG_NET_POLL_CONTROLLER 517 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 518 struct sk_buff *skb) 519 { 520 struct netpoll *np = p->np; 521 522 if (np) 523 netpoll_send_skb(np, skb); 524 } 525 526 int br_netpoll_enable(struct net_bridge_port *p); 527 void br_netpoll_disable(struct net_bridge_port *p); 528 #else 529 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 530 struct sk_buff *skb) 531 { 532 } 533 534 static inline int br_netpoll_enable(struct net_bridge_port *p) 535 { 536 return 0; 537 } 538 539 static inline void br_netpoll_disable(struct net_bridge_port *p) 540 { 541 } 542 #endif 543 544 /* br_fdb.c */ 545 int br_fdb_init(void); 546 void br_fdb_fini(void); 547 int br_fdb_hash_init(struct net_bridge *br); 548 void br_fdb_hash_fini(struct net_bridge *br); 549 void br_fdb_flush(struct net_bridge *br); 550 void br_fdb_find_delete_local(struct net_bridge *br, 551 const struct net_bridge_port *p, 552 const unsigned char *addr, u16 vid); 553 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 554 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 555 void br_fdb_cleanup(struct work_struct *work); 556 void br_fdb_delete_by_port(struct net_bridge *br, 557 const struct net_bridge_port *p, u16 vid, int do_all); 558 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 559 const unsigned char *addr, 560 __u16 vid); 561 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 562 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 563 unsigned long off); 564 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 565 const unsigned char *addr, u16 vid); 566 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 567 const unsigned char *addr, u16 vid, bool added_by_user); 568 569 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 570 struct net_device *dev, const unsigned char *addr, u16 vid); 571 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 572 const unsigned char *addr, u16 vid, u16 nlh_flags); 573 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 574 struct net_device *dev, struct net_device *fdev, int *idx); 575 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 576 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 577 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 578 const unsigned char *addr, u16 vid, 579 bool swdev_notify); 580 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 581 const unsigned char *addr, u16 vid, 582 bool swdev_notify); 583 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 584 const unsigned char *addr, u16 vid, bool offloaded); 585 586 /* br_forward.c */ 587 enum br_pkt_type { 588 BR_PKT_UNICAST, 589 BR_PKT_MULTICAST, 590 BR_PKT_BROADCAST 591 }; 592 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 593 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 594 bool local_rcv, bool local_orig); 595 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 596 void br_flood(struct net_bridge *br, struct sk_buff *skb, 597 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 598 599 /* return true if both source port and dest port are isolated */ 600 static inline bool br_skb_isolated(const struct net_bridge_port *to, 601 const struct sk_buff *skb) 602 { 603 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 604 (to->flags & BR_ISOLATED); 605 } 606 607 /* br_if.c */ 608 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 609 int br_add_bridge(struct net *net, const char *name); 610 int br_del_bridge(struct net *net, const char *name); 611 int br_add_if(struct net_bridge *br, struct net_device *dev, 612 struct netlink_ext_ack *extack); 613 int br_del_if(struct net_bridge *br, struct net_device *dev); 614 void br_mtu_auto_adjust(struct net_bridge *br); 615 netdev_features_t br_features_recompute(struct net_bridge *br, 616 netdev_features_t features); 617 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 618 void br_manage_promisc(struct net_bridge *br); 619 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 620 621 /* br_input.c */ 622 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 623 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 624 625 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 626 { 627 return rcu_dereference(dev->rx_handler) == br_handle_frame; 628 } 629 630 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 631 { 632 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 633 } 634 635 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 636 { 637 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 638 } 639 640 static inline struct net_bridge_port * 641 br_port_get_check_rtnl(const struct net_device *dev) 642 { 643 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 644 } 645 646 /* br_ioctl.c */ 647 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 648 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 649 void __user *arg); 650 651 /* br_multicast.c */ 652 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 653 extern unsigned int br_mdb_rehash_seq; 654 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 655 struct sk_buff *skb, u16 vid); 656 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 657 struct sk_buff *skb, u16 vid); 658 int br_multicast_add_port(struct net_bridge_port *port); 659 void br_multicast_del_port(struct net_bridge_port *port); 660 void br_multicast_enable_port(struct net_bridge_port *port); 661 void br_multicast_disable_port(struct net_bridge_port *port); 662 void br_multicast_init(struct net_bridge *br); 663 void br_multicast_open(struct net_bridge *br); 664 void br_multicast_stop(struct net_bridge *br); 665 void br_multicast_dev_del(struct net_bridge *br); 666 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 667 struct sk_buff *skb, bool local_rcv, bool local_orig); 668 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 669 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 670 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 671 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 672 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 673 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 674 #if IS_ENABLED(CONFIG_IPV6) 675 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 676 #endif 677 struct net_bridge_mdb_entry * 678 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 679 struct net_bridge_mdb_entry * 680 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 681 struct br_ip *group); 682 void br_multicast_free_pg(struct rcu_head *head); 683 struct net_bridge_port_group * 684 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 685 struct net_bridge_port_group __rcu *next, 686 unsigned char flags, const unsigned char *src); 687 void br_mdb_init(void); 688 void br_mdb_uninit(void); 689 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 690 struct br_ip *group, int type, u8 flags); 691 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 692 int type); 693 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 694 const struct sk_buff *skb, u8 type, u8 dir); 695 int br_multicast_init_stats(struct net_bridge *br); 696 void br_multicast_uninit_stats(struct net_bridge *br); 697 void br_multicast_get_stats(const struct net_bridge *br, 698 const struct net_bridge_port *p, 699 struct br_mcast_stats *dest); 700 701 #define mlock_dereference(X, br) \ 702 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 703 704 static inline bool br_multicast_is_router(struct net_bridge *br) 705 { 706 return br->multicast_router == 2 || 707 (br->multicast_router == 1 && 708 timer_pending(&br->multicast_router_timer)); 709 } 710 711 static inline bool 712 __br_multicast_querier_exists(struct net_bridge *br, 713 struct bridge_mcast_other_query *querier, 714 const bool is_ipv6) 715 { 716 bool own_querier_enabled; 717 718 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 719 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 720 own_querier_enabled = false; 721 else 722 own_querier_enabled = true; 723 } else { 724 own_querier_enabled = false; 725 } 726 727 return time_is_before_jiffies(querier->delay_time) && 728 (own_querier_enabled || timer_pending(&querier->timer)); 729 } 730 731 static inline bool br_multicast_querier_exists(struct net_bridge *br, 732 struct ethhdr *eth) 733 { 734 switch (eth->h_proto) { 735 case (htons(ETH_P_IP)): 736 return __br_multicast_querier_exists(br, 737 &br->ip4_other_query, false); 738 #if IS_ENABLED(CONFIG_IPV6) 739 case (htons(ETH_P_IPV6)): 740 return __br_multicast_querier_exists(br, 741 &br->ip6_other_query, true); 742 #endif 743 default: 744 return false; 745 } 746 } 747 748 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 749 { 750 return BR_INPUT_SKB_CB(skb)->igmp; 751 } 752 #else 753 static inline int br_multicast_rcv(struct net_bridge *br, 754 struct net_bridge_port *port, 755 struct sk_buff *skb, 756 u16 vid) 757 { 758 return 0; 759 } 760 761 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 762 struct sk_buff *skb, u16 vid) 763 { 764 return NULL; 765 } 766 767 static inline int br_multicast_add_port(struct net_bridge_port *port) 768 { 769 return 0; 770 } 771 772 static inline void br_multicast_del_port(struct net_bridge_port *port) 773 { 774 } 775 776 static inline void br_multicast_enable_port(struct net_bridge_port *port) 777 { 778 } 779 780 static inline void br_multicast_disable_port(struct net_bridge_port *port) 781 { 782 } 783 784 static inline void br_multicast_init(struct net_bridge *br) 785 { 786 } 787 788 static inline void br_multicast_open(struct net_bridge *br) 789 { 790 } 791 792 static inline void br_multicast_stop(struct net_bridge *br) 793 { 794 } 795 796 static inline void br_multicast_dev_del(struct net_bridge *br) 797 { 798 } 799 800 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 801 struct sk_buff *skb, 802 bool local_rcv, bool local_orig) 803 { 804 } 805 806 static inline bool br_multicast_is_router(struct net_bridge *br) 807 { 808 return false; 809 } 810 811 static inline bool br_multicast_querier_exists(struct net_bridge *br, 812 struct ethhdr *eth) 813 { 814 return false; 815 } 816 817 static inline void br_mdb_init(void) 818 { 819 } 820 821 static inline void br_mdb_uninit(void) 822 { 823 } 824 825 static inline void br_multicast_count(struct net_bridge *br, 826 const struct net_bridge_port *p, 827 const struct sk_buff *skb, 828 u8 type, u8 dir) 829 { 830 } 831 832 static inline int br_multicast_init_stats(struct net_bridge *br) 833 { 834 return 0; 835 } 836 837 static inline void br_multicast_uninit_stats(struct net_bridge *br) 838 { 839 } 840 841 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 842 { 843 return 0; 844 } 845 #endif 846 847 /* br_vlan.c */ 848 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 849 bool br_allowed_ingress(const struct net_bridge *br, 850 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 851 u16 *vid); 852 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 853 const struct sk_buff *skb); 854 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 855 struct sk_buff *br_handle_vlan(struct net_bridge *br, 856 const struct net_bridge_port *port, 857 struct net_bridge_vlan_group *vg, 858 struct sk_buff *skb); 859 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 860 bool *changed); 861 int br_vlan_delete(struct net_bridge *br, u16 vid); 862 void br_vlan_flush(struct net_bridge *br); 863 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 864 void br_recalculate_fwd_mask(struct net_bridge *br); 865 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 866 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 867 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 868 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 869 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 870 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 871 int br_vlan_init(struct net_bridge *br); 872 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 873 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 874 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 875 bool *changed); 876 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 877 void nbp_vlan_flush(struct net_bridge_port *port); 878 int nbp_vlan_init(struct net_bridge_port *port); 879 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 880 void br_vlan_get_stats(const struct net_bridge_vlan *v, 881 struct br_vlan_stats *stats); 882 883 static inline struct net_bridge_vlan_group *br_vlan_group( 884 const struct net_bridge *br) 885 { 886 return rtnl_dereference(br->vlgrp); 887 } 888 889 static inline struct net_bridge_vlan_group *nbp_vlan_group( 890 const struct net_bridge_port *p) 891 { 892 return rtnl_dereference(p->vlgrp); 893 } 894 895 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 896 const struct net_bridge *br) 897 { 898 return rcu_dereference(br->vlgrp); 899 } 900 901 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 902 const struct net_bridge_port *p) 903 { 904 return rcu_dereference(p->vlgrp); 905 } 906 907 /* Since bridge now depends on 8021Q module, but the time bridge sees the 908 * skb, the vlan tag will always be present if the frame was tagged. 909 */ 910 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 911 { 912 int err = 0; 913 914 if (skb_vlan_tag_present(skb)) { 915 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 916 } else { 917 *vid = 0; 918 err = -EINVAL; 919 } 920 921 return err; 922 } 923 924 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 925 { 926 if (!vg) 927 return 0; 928 929 smp_rmb(); 930 return vg->pvid; 931 } 932 933 #else 934 static inline bool br_allowed_ingress(const struct net_bridge *br, 935 struct net_bridge_vlan_group *vg, 936 struct sk_buff *skb, 937 u16 *vid) 938 { 939 return true; 940 } 941 942 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 943 const struct sk_buff *skb) 944 { 945 return true; 946 } 947 948 static inline bool br_should_learn(struct net_bridge_port *p, 949 struct sk_buff *skb, u16 *vid) 950 { 951 return true; 952 } 953 954 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 955 const struct net_bridge_port *port, 956 struct net_bridge_vlan_group *vg, 957 struct sk_buff *skb) 958 { 959 return skb; 960 } 961 962 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 963 bool *changed) 964 { 965 *changed = false; 966 return -EOPNOTSUPP; 967 } 968 969 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 970 { 971 return -EOPNOTSUPP; 972 } 973 974 static inline void br_vlan_flush(struct net_bridge *br) 975 { 976 } 977 978 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 979 { 980 } 981 982 static inline int br_vlan_init(struct net_bridge *br) 983 { 984 return 0; 985 } 986 987 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 988 bool *changed) 989 { 990 *changed = false; 991 return -EOPNOTSUPP; 992 } 993 994 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 995 { 996 return -EOPNOTSUPP; 997 } 998 999 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1000 { 1001 } 1002 1003 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1004 u16 vid) 1005 { 1006 return NULL; 1007 } 1008 1009 static inline int nbp_vlan_init(struct net_bridge_port *port) 1010 { 1011 return 0; 1012 } 1013 1014 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1015 { 1016 return 0; 1017 } 1018 1019 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1020 { 1021 return 0; 1022 } 1023 1024 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1025 unsigned long val) 1026 { 1027 return -EOPNOTSUPP; 1028 } 1029 1030 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1031 u32 filter_mask) 1032 { 1033 return 0; 1034 } 1035 1036 static inline struct net_bridge_vlan_group *br_vlan_group( 1037 const struct net_bridge *br) 1038 { 1039 return NULL; 1040 } 1041 1042 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1043 const struct net_bridge_port *p) 1044 { 1045 return NULL; 1046 } 1047 1048 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1049 const struct net_bridge *br) 1050 { 1051 return NULL; 1052 } 1053 1054 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1055 const struct net_bridge_port *p) 1056 { 1057 return NULL; 1058 } 1059 1060 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1061 struct br_vlan_stats *stats) 1062 { 1063 } 1064 #endif 1065 1066 struct nf_br_ops { 1067 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1068 }; 1069 extern const struct nf_br_ops __rcu *nf_br_ops; 1070 1071 /* br_netfilter.c */ 1072 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1073 int br_nf_core_init(void); 1074 void br_nf_core_fini(void); 1075 void br_netfilter_rtable_init(struct net_bridge *); 1076 #else 1077 static inline int br_nf_core_init(void) { return 0; } 1078 static inline void br_nf_core_fini(void) {} 1079 #define br_netfilter_rtable_init(x) 1080 #endif 1081 1082 /* br_stp.c */ 1083 void br_set_state(struct net_bridge_port *p, unsigned int state); 1084 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1085 void br_init_port(struct net_bridge_port *p); 1086 void br_become_designated_port(struct net_bridge_port *p); 1087 1088 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1089 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1090 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1091 int br_set_max_age(struct net_bridge *br, unsigned long x); 1092 int __set_ageing_time(struct net_device *dev, unsigned long t); 1093 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1094 1095 1096 /* br_stp_if.c */ 1097 void br_stp_enable_bridge(struct net_bridge *br); 1098 void br_stp_disable_bridge(struct net_bridge *br); 1099 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1100 void br_stp_enable_port(struct net_bridge_port *p); 1101 void br_stp_disable_port(struct net_bridge_port *p); 1102 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1103 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1104 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1105 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1106 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1107 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1108 1109 /* br_stp_bpdu.c */ 1110 struct stp_proto; 1111 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1112 struct net_device *dev); 1113 1114 /* br_stp_timer.c */ 1115 void br_stp_timer_init(struct net_bridge *br); 1116 void br_stp_port_timer_init(struct net_bridge_port *p); 1117 unsigned long br_timer_value(const struct timer_list *timer); 1118 1119 /* br.c */ 1120 #if IS_ENABLED(CONFIG_ATM_LANE) 1121 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1122 #endif 1123 1124 /* br_netlink.c */ 1125 extern struct rtnl_link_ops br_link_ops; 1126 int br_netlink_init(void); 1127 void br_netlink_fini(void); 1128 void br_ifinfo_notify(int event, const struct net_bridge *br, 1129 const struct net_bridge_port *port); 1130 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1131 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1132 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1133 u32 filter_mask, int nlflags); 1134 1135 #ifdef CONFIG_SYSFS 1136 /* br_sysfs_if.c */ 1137 extern const struct sysfs_ops brport_sysfs_ops; 1138 int br_sysfs_addif(struct net_bridge_port *p); 1139 int br_sysfs_renameif(struct net_bridge_port *p); 1140 1141 /* br_sysfs_br.c */ 1142 int br_sysfs_addbr(struct net_device *dev); 1143 void br_sysfs_delbr(struct net_device *dev); 1144 1145 #else 1146 1147 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1148 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1149 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1150 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1151 #endif /* CONFIG_SYSFS */ 1152 1153 /* br_switchdev.c */ 1154 #ifdef CONFIG_NET_SWITCHDEV 1155 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1156 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1157 struct sk_buff *skb); 1158 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1159 const struct sk_buff *skb); 1160 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1161 unsigned long flags, 1162 unsigned long mask); 1163 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1164 int type); 1165 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags); 1166 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1167 1168 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1169 { 1170 skb->offload_fwd_mark = 0; 1171 } 1172 #else 1173 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1174 { 1175 return 0; 1176 } 1177 1178 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1179 struct sk_buff *skb) 1180 { 1181 } 1182 1183 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1184 const struct sk_buff *skb) 1185 { 1186 return true; 1187 } 1188 1189 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1190 unsigned long flags, 1191 unsigned long mask) 1192 { 1193 return 0; 1194 } 1195 1196 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1197 u16 vid, u16 flags) 1198 { 1199 return -EOPNOTSUPP; 1200 } 1201 1202 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1203 { 1204 return -EOPNOTSUPP; 1205 } 1206 1207 static inline void 1208 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1209 { 1210 } 1211 1212 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1213 { 1214 } 1215 #endif /* CONFIG_NET_SWITCHDEV */ 1216 1217 /* br_arp_nd_proxy.c */ 1218 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1219 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1220 u16 vid, struct net_bridge_port *p); 1221 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1222 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1223 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1224 #endif 1225