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 is_sticky:1, 185 added_by_user:1, 186 added_by_external_learn:1, 187 offloaded:1; 188 189 /* write-heavy members should not affect lookups */ 190 unsigned long updated ____cacheline_aligned_in_smp; 191 unsigned long used; 192 193 struct rcu_head rcu; 194 }; 195 196 #define MDB_PG_FLAGS_PERMANENT BIT(0) 197 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 198 199 struct net_bridge_port_group { 200 struct net_bridge_port *port; 201 struct net_bridge_port_group __rcu *next; 202 struct hlist_node mglist; 203 struct rcu_head rcu; 204 struct timer_list timer; 205 struct br_ip addr; 206 unsigned char flags; 207 unsigned char eth_addr[ETH_ALEN]; 208 }; 209 210 struct net_bridge_mdb_entry 211 { 212 struct hlist_node hlist[2]; 213 struct net_bridge *br; 214 struct net_bridge_port_group __rcu *ports; 215 struct rcu_head rcu; 216 struct timer_list timer; 217 struct br_ip addr; 218 bool host_joined; 219 }; 220 221 struct net_bridge_mdb_htable 222 { 223 struct hlist_head *mhash; 224 struct rcu_head rcu; 225 struct net_bridge_mdb_htable *old; 226 u32 size; 227 u32 max; 228 u32 secret; 229 u32 ver; 230 }; 231 232 struct net_bridge_port { 233 struct net_bridge *br; 234 struct net_device *dev; 235 struct list_head list; 236 237 unsigned long flags; 238 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 239 struct net_bridge_vlan_group __rcu *vlgrp; 240 #endif 241 struct net_bridge_port __rcu *backup_port; 242 243 /* STP */ 244 u8 priority; 245 u8 state; 246 u16 port_no; 247 unsigned char topology_change_ack; 248 unsigned char config_pending; 249 port_id port_id; 250 port_id designated_port; 251 bridge_id designated_root; 252 bridge_id designated_bridge; 253 u32 path_cost; 254 u32 designated_cost; 255 unsigned long designated_age; 256 257 struct timer_list forward_delay_timer; 258 struct timer_list hold_timer; 259 struct timer_list message_age_timer; 260 struct kobject kobj; 261 struct rcu_head rcu; 262 263 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 264 struct bridge_mcast_own_query ip4_own_query; 265 #if IS_ENABLED(CONFIG_IPV6) 266 struct bridge_mcast_own_query ip6_own_query; 267 #endif /* IS_ENABLED(CONFIG_IPV6) */ 268 unsigned char multicast_router; 269 struct bridge_mcast_stats __percpu *mcast_stats; 270 struct timer_list multicast_router_timer; 271 struct hlist_head mglist; 272 struct hlist_node rlist; 273 #endif 274 275 #ifdef CONFIG_SYSFS 276 char sysfs_name[IFNAMSIZ]; 277 #endif 278 279 #ifdef CONFIG_NET_POLL_CONTROLLER 280 struct netpoll *np; 281 #endif 282 #ifdef CONFIG_NET_SWITCHDEV 283 int offload_fwd_mark; 284 #endif 285 u16 group_fwd_mask; 286 u16 backup_redirected_cnt; 287 }; 288 289 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 290 291 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 292 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 293 294 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 295 296 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 297 { 298 return rcu_dereference(dev->rx_handler_data); 299 } 300 301 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 302 { 303 return br_port_exists(dev) ? 304 rtnl_dereference(dev->rx_handler_data) : NULL; 305 } 306 307 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 308 { 309 return br_port_exists(dev) ? 310 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 311 } 312 313 struct net_bridge { 314 spinlock_t lock; 315 spinlock_t hash_lock; 316 struct list_head port_list; 317 struct net_device *dev; 318 struct pcpu_sw_netstats __percpu *stats; 319 /* These fields are accessed on each packet */ 320 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 321 u8 vlan_enabled; 322 u8 vlan_stats_enabled; 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 /* br_device.c */ 497 void br_dev_setup(struct net_device *dev); 498 void br_dev_delete(struct net_device *dev, struct list_head *list); 499 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 500 #ifdef CONFIG_NET_POLL_CONTROLLER 501 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 502 struct sk_buff *skb) 503 { 504 struct netpoll *np = p->np; 505 506 if (np) 507 netpoll_send_skb(np, skb); 508 } 509 510 int br_netpoll_enable(struct net_bridge_port *p); 511 void br_netpoll_disable(struct net_bridge_port *p); 512 #else 513 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 514 struct sk_buff *skb) 515 { 516 } 517 518 static inline int br_netpoll_enable(struct net_bridge_port *p) 519 { 520 return 0; 521 } 522 523 static inline void br_netpoll_disable(struct net_bridge_port *p) 524 { 525 } 526 #endif 527 528 /* br_fdb.c */ 529 int br_fdb_init(void); 530 void br_fdb_fini(void); 531 int br_fdb_hash_init(struct net_bridge *br); 532 void br_fdb_hash_fini(struct net_bridge *br); 533 void br_fdb_flush(struct net_bridge *br); 534 void br_fdb_find_delete_local(struct net_bridge *br, 535 const struct net_bridge_port *p, 536 const unsigned char *addr, u16 vid); 537 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 538 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 539 void br_fdb_cleanup(struct work_struct *work); 540 void br_fdb_delete_by_port(struct net_bridge *br, 541 const struct net_bridge_port *p, u16 vid, int do_all); 542 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 543 const unsigned char *addr, 544 __u16 vid); 545 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 546 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 547 unsigned long off); 548 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 549 const unsigned char *addr, u16 vid); 550 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 551 const unsigned char *addr, u16 vid, bool added_by_user); 552 553 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 554 struct net_device *dev, const unsigned char *addr, u16 vid); 555 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 556 const unsigned char *addr, u16 vid, u16 nlh_flags); 557 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 558 struct net_device *dev, struct net_device *fdev, int *idx); 559 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 560 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 561 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 562 const unsigned char *addr, u16 vid, 563 bool swdev_notify); 564 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 565 const unsigned char *addr, u16 vid, 566 bool swdev_notify); 567 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 568 const unsigned char *addr, u16 vid); 569 570 /* br_forward.c */ 571 enum br_pkt_type { 572 BR_PKT_UNICAST, 573 BR_PKT_MULTICAST, 574 BR_PKT_BROADCAST 575 }; 576 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 577 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 578 bool local_rcv, bool local_orig); 579 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 580 void br_flood(struct net_bridge *br, struct sk_buff *skb, 581 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 582 583 /* return true if both source port and dest port are isolated */ 584 static inline bool br_skb_isolated(const struct net_bridge_port *to, 585 const struct sk_buff *skb) 586 { 587 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 588 (to->flags & BR_ISOLATED); 589 } 590 591 /* br_if.c */ 592 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 593 int br_add_bridge(struct net *net, const char *name); 594 int br_del_bridge(struct net *net, const char *name); 595 int br_add_if(struct net_bridge *br, struct net_device *dev, 596 struct netlink_ext_ack *extack); 597 int br_del_if(struct net_bridge *br, struct net_device *dev); 598 void br_mtu_auto_adjust(struct net_bridge *br); 599 netdev_features_t br_features_recompute(struct net_bridge *br, 600 netdev_features_t features); 601 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 602 void br_manage_promisc(struct net_bridge *br); 603 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 604 605 /* br_input.c */ 606 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 607 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 608 609 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 610 { 611 return rcu_dereference(dev->rx_handler) == br_handle_frame; 612 } 613 614 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 615 { 616 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 617 } 618 619 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 620 { 621 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 622 } 623 624 static inline struct net_bridge_port * 625 br_port_get_check_rtnl(const struct net_device *dev) 626 { 627 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 628 } 629 630 /* br_ioctl.c */ 631 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 632 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 633 void __user *arg); 634 635 /* br_multicast.c */ 636 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 637 extern unsigned int br_mdb_rehash_seq; 638 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 639 struct sk_buff *skb, u16 vid); 640 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 641 struct sk_buff *skb, u16 vid); 642 int br_multicast_add_port(struct net_bridge_port *port); 643 void br_multicast_del_port(struct net_bridge_port *port); 644 void br_multicast_enable_port(struct net_bridge_port *port); 645 void br_multicast_disable_port(struct net_bridge_port *port); 646 void br_multicast_init(struct net_bridge *br); 647 void br_multicast_open(struct net_bridge *br); 648 void br_multicast_stop(struct net_bridge *br); 649 void br_multicast_dev_del(struct net_bridge *br); 650 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 651 struct sk_buff *skb, bool local_rcv, bool local_orig); 652 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 653 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 654 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 655 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 656 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 657 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 658 #if IS_ENABLED(CONFIG_IPV6) 659 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 660 #endif 661 struct net_bridge_mdb_entry * 662 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 663 struct net_bridge_mdb_entry * 664 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 665 struct br_ip *group); 666 void br_multicast_free_pg(struct rcu_head *head); 667 struct net_bridge_port_group * 668 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 669 struct net_bridge_port_group __rcu *next, 670 unsigned char flags, const unsigned char *src); 671 void br_mdb_init(void); 672 void br_mdb_uninit(void); 673 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 674 struct br_ip *group, int type, u8 flags); 675 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 676 int type); 677 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 678 const struct sk_buff *skb, u8 type, u8 dir); 679 int br_multicast_init_stats(struct net_bridge *br); 680 void br_multicast_uninit_stats(struct net_bridge *br); 681 void br_multicast_get_stats(const struct net_bridge *br, 682 const struct net_bridge_port *p, 683 struct br_mcast_stats *dest); 684 685 #define mlock_dereference(X, br) \ 686 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 687 688 static inline bool br_multicast_is_router(struct net_bridge *br) 689 { 690 return br->multicast_router == 2 || 691 (br->multicast_router == 1 && 692 timer_pending(&br->multicast_router_timer)); 693 } 694 695 static inline bool 696 __br_multicast_querier_exists(struct net_bridge *br, 697 struct bridge_mcast_other_query *querier, 698 const bool is_ipv6) 699 { 700 bool own_querier_enabled; 701 702 if (br->multicast_querier) { 703 if (is_ipv6 && !br->has_ipv6_addr) 704 own_querier_enabled = false; 705 else 706 own_querier_enabled = true; 707 } else { 708 own_querier_enabled = false; 709 } 710 711 return time_is_before_jiffies(querier->delay_time) && 712 (own_querier_enabled || timer_pending(&querier->timer)); 713 } 714 715 static inline bool br_multicast_querier_exists(struct net_bridge *br, 716 struct ethhdr *eth) 717 { 718 switch (eth->h_proto) { 719 case (htons(ETH_P_IP)): 720 return __br_multicast_querier_exists(br, 721 &br->ip4_other_query, false); 722 #if IS_ENABLED(CONFIG_IPV6) 723 case (htons(ETH_P_IPV6)): 724 return __br_multicast_querier_exists(br, 725 &br->ip6_other_query, true); 726 #endif 727 default: 728 return false; 729 } 730 } 731 732 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 733 { 734 return BR_INPUT_SKB_CB(skb)->igmp; 735 } 736 #else 737 static inline int br_multicast_rcv(struct net_bridge *br, 738 struct net_bridge_port *port, 739 struct sk_buff *skb, 740 u16 vid) 741 { 742 return 0; 743 } 744 745 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 746 struct sk_buff *skb, u16 vid) 747 { 748 return NULL; 749 } 750 751 static inline int br_multicast_add_port(struct net_bridge_port *port) 752 { 753 return 0; 754 } 755 756 static inline void br_multicast_del_port(struct net_bridge_port *port) 757 { 758 } 759 760 static inline void br_multicast_enable_port(struct net_bridge_port *port) 761 { 762 } 763 764 static inline void br_multicast_disable_port(struct net_bridge_port *port) 765 { 766 } 767 768 static inline void br_multicast_init(struct net_bridge *br) 769 { 770 } 771 772 static inline void br_multicast_open(struct net_bridge *br) 773 { 774 } 775 776 static inline void br_multicast_stop(struct net_bridge *br) 777 { 778 } 779 780 static inline void br_multicast_dev_del(struct net_bridge *br) 781 { 782 } 783 784 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 785 struct sk_buff *skb, 786 bool local_rcv, bool local_orig) 787 { 788 } 789 790 static inline bool br_multicast_is_router(struct net_bridge *br) 791 { 792 return false; 793 } 794 795 static inline bool br_multicast_querier_exists(struct net_bridge *br, 796 struct ethhdr *eth) 797 { 798 return false; 799 } 800 801 static inline void br_mdb_init(void) 802 { 803 } 804 805 static inline void br_mdb_uninit(void) 806 { 807 } 808 809 static inline void br_multicast_count(struct net_bridge *br, 810 const struct net_bridge_port *p, 811 const struct sk_buff *skb, 812 u8 type, u8 dir) 813 { 814 } 815 816 static inline int br_multicast_init_stats(struct net_bridge *br) 817 { 818 return 0; 819 } 820 821 static inline void br_multicast_uninit_stats(struct net_bridge *br) 822 { 823 } 824 825 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 826 { 827 return 0; 828 } 829 #endif 830 831 /* br_vlan.c */ 832 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 833 bool br_allowed_ingress(const struct net_bridge *br, 834 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 835 u16 *vid); 836 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 837 const struct sk_buff *skb); 838 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 839 struct sk_buff *br_handle_vlan(struct net_bridge *br, 840 const struct net_bridge_port *port, 841 struct net_bridge_vlan_group *vg, 842 struct sk_buff *skb); 843 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 844 bool *changed); 845 int br_vlan_delete(struct net_bridge *br, u16 vid); 846 void br_vlan_flush(struct net_bridge *br); 847 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 848 void br_recalculate_fwd_mask(struct net_bridge *br); 849 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 850 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 851 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 852 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 853 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 854 int br_vlan_init(struct net_bridge *br); 855 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 856 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 857 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 858 bool *changed); 859 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 860 void nbp_vlan_flush(struct net_bridge_port *port); 861 int nbp_vlan_init(struct net_bridge_port *port); 862 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 863 void br_vlan_get_stats(const struct net_bridge_vlan *v, 864 struct br_vlan_stats *stats); 865 866 static inline struct net_bridge_vlan_group *br_vlan_group( 867 const struct net_bridge *br) 868 { 869 return rtnl_dereference(br->vlgrp); 870 } 871 872 static inline struct net_bridge_vlan_group *nbp_vlan_group( 873 const struct net_bridge_port *p) 874 { 875 return rtnl_dereference(p->vlgrp); 876 } 877 878 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 879 const struct net_bridge *br) 880 { 881 return rcu_dereference(br->vlgrp); 882 } 883 884 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 885 const struct net_bridge_port *p) 886 { 887 return rcu_dereference(p->vlgrp); 888 } 889 890 /* Since bridge now depends on 8021Q module, but the time bridge sees the 891 * skb, the vlan tag will always be present if the frame was tagged. 892 */ 893 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 894 { 895 int err = 0; 896 897 if (skb_vlan_tag_present(skb)) { 898 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 899 } else { 900 *vid = 0; 901 err = -EINVAL; 902 } 903 904 return err; 905 } 906 907 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 908 { 909 if (!vg) 910 return 0; 911 912 smp_rmb(); 913 return vg->pvid; 914 } 915 916 #else 917 static inline bool br_allowed_ingress(const struct net_bridge *br, 918 struct net_bridge_vlan_group *vg, 919 struct sk_buff *skb, 920 u16 *vid) 921 { 922 return true; 923 } 924 925 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 926 const struct sk_buff *skb) 927 { 928 return true; 929 } 930 931 static inline bool br_should_learn(struct net_bridge_port *p, 932 struct sk_buff *skb, u16 *vid) 933 { 934 return true; 935 } 936 937 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 938 const struct net_bridge_port *port, 939 struct net_bridge_vlan_group *vg, 940 struct sk_buff *skb) 941 { 942 return skb; 943 } 944 945 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 946 bool *changed) 947 { 948 *changed = false; 949 return -EOPNOTSUPP; 950 } 951 952 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 953 { 954 return -EOPNOTSUPP; 955 } 956 957 static inline void br_vlan_flush(struct net_bridge *br) 958 { 959 } 960 961 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 962 { 963 } 964 965 static inline int br_vlan_init(struct net_bridge *br) 966 { 967 return 0; 968 } 969 970 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 971 bool *changed) 972 { 973 *changed = false; 974 return -EOPNOTSUPP; 975 } 976 977 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 978 { 979 return -EOPNOTSUPP; 980 } 981 982 static inline void nbp_vlan_flush(struct net_bridge_port *port) 983 { 984 } 985 986 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 987 u16 vid) 988 { 989 return NULL; 990 } 991 992 static inline int nbp_vlan_init(struct net_bridge_port *port) 993 { 994 return 0; 995 } 996 997 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 998 { 999 return 0; 1000 } 1001 1002 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1003 { 1004 return 0; 1005 } 1006 1007 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1008 unsigned long val) 1009 { 1010 return -EOPNOTSUPP; 1011 } 1012 1013 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1014 u32 filter_mask) 1015 { 1016 return 0; 1017 } 1018 1019 static inline struct net_bridge_vlan_group *br_vlan_group( 1020 const struct net_bridge *br) 1021 { 1022 return NULL; 1023 } 1024 1025 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1026 const struct net_bridge_port *p) 1027 { 1028 return NULL; 1029 } 1030 1031 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1032 const struct net_bridge *br) 1033 { 1034 return NULL; 1035 } 1036 1037 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1038 const struct net_bridge_port *p) 1039 { 1040 return NULL; 1041 } 1042 1043 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1044 struct br_vlan_stats *stats) 1045 { 1046 } 1047 #endif 1048 1049 struct nf_br_ops { 1050 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1051 }; 1052 extern const struct nf_br_ops __rcu *nf_br_ops; 1053 1054 /* br_netfilter.c */ 1055 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1056 int br_nf_core_init(void); 1057 void br_nf_core_fini(void); 1058 void br_netfilter_rtable_init(struct net_bridge *); 1059 #else 1060 static inline int br_nf_core_init(void) { return 0; } 1061 static inline void br_nf_core_fini(void) {} 1062 #define br_netfilter_rtable_init(x) 1063 #endif 1064 1065 /* br_stp.c */ 1066 void br_set_state(struct net_bridge_port *p, unsigned int state); 1067 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1068 void br_init_port(struct net_bridge_port *p); 1069 void br_become_designated_port(struct net_bridge_port *p); 1070 1071 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1072 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1073 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1074 int br_set_max_age(struct net_bridge *br, unsigned long x); 1075 int __set_ageing_time(struct net_device *dev, unsigned long t); 1076 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1077 1078 1079 /* br_stp_if.c */ 1080 void br_stp_enable_bridge(struct net_bridge *br); 1081 void br_stp_disable_bridge(struct net_bridge *br); 1082 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1083 void br_stp_enable_port(struct net_bridge_port *p); 1084 void br_stp_disable_port(struct net_bridge_port *p); 1085 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1086 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1087 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1088 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1089 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1090 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1091 1092 /* br_stp_bpdu.c */ 1093 struct stp_proto; 1094 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1095 struct net_device *dev); 1096 1097 /* br_stp_timer.c */ 1098 void br_stp_timer_init(struct net_bridge *br); 1099 void br_stp_port_timer_init(struct net_bridge_port *p); 1100 unsigned long br_timer_value(const struct timer_list *timer); 1101 1102 /* br.c */ 1103 #if IS_ENABLED(CONFIG_ATM_LANE) 1104 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1105 #endif 1106 1107 /* br_netlink.c */ 1108 extern struct rtnl_link_ops br_link_ops; 1109 int br_netlink_init(void); 1110 void br_netlink_fini(void); 1111 void br_ifinfo_notify(int event, const struct net_bridge *br, 1112 const struct net_bridge_port *port); 1113 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1114 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1115 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1116 u32 filter_mask, int nlflags); 1117 1118 #ifdef CONFIG_SYSFS 1119 /* br_sysfs_if.c */ 1120 extern const struct sysfs_ops brport_sysfs_ops; 1121 int br_sysfs_addif(struct net_bridge_port *p); 1122 int br_sysfs_renameif(struct net_bridge_port *p); 1123 1124 /* br_sysfs_br.c */ 1125 int br_sysfs_addbr(struct net_device *dev); 1126 void br_sysfs_delbr(struct net_device *dev); 1127 1128 #else 1129 1130 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1131 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1132 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1133 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1134 #endif /* CONFIG_SYSFS */ 1135 1136 /* br_switchdev.c */ 1137 #ifdef CONFIG_NET_SWITCHDEV 1138 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1139 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1140 struct sk_buff *skb); 1141 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1142 const struct sk_buff *skb); 1143 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1144 unsigned long flags, 1145 unsigned long mask); 1146 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1147 int type); 1148 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags); 1149 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1150 1151 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1152 { 1153 skb->offload_fwd_mark = 0; 1154 } 1155 #else 1156 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1157 { 1158 return 0; 1159 } 1160 1161 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1162 struct sk_buff *skb) 1163 { 1164 } 1165 1166 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1167 const struct sk_buff *skb) 1168 { 1169 return true; 1170 } 1171 1172 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1173 unsigned long flags, 1174 unsigned long mask) 1175 { 1176 return 0; 1177 } 1178 1179 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1180 u16 vid, u16 flags) 1181 { 1182 return -EOPNOTSUPP; 1183 } 1184 1185 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1186 { 1187 return -EOPNOTSUPP; 1188 } 1189 1190 static inline void 1191 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1192 { 1193 } 1194 1195 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1196 { 1197 } 1198 #endif /* CONFIG_NET_SWITCHDEV */ 1199 1200 /* br_arp_nd_proxy.c */ 1201 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1202 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1203 u16 vid, struct net_bridge_port *p); 1204 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1205 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1206 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1207 #endif 1208