1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 */ 8 9 #ifndef _BR_PRIVATE_H 10 #define _BR_PRIVATE_H 11 12 #include <linux/netdevice.h> 13 #include <linux/if_bridge.h> 14 #include <linux/netpoll.h> 15 #include <linux/u64_stats_sync.h> 16 #include <net/route.h> 17 #include <net/ip6_fib.h> 18 #include <linux/if_vlan.h> 19 #include <linux/rhashtable.h> 20 #include <linux/refcount.h> 21 22 #define BR_HASH_BITS 8 23 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 24 25 #define BR_HOLD_TIME (1*HZ) 26 27 #define BR_PORT_BITS 10 28 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 29 30 #define BR_MULTICAST_DEFAULT_HASH_MAX 4096 31 32 #define BR_VERSION "2.3" 33 34 /* Control of forwarding link local multicast */ 35 #define BR_GROUPFWD_DEFAULT 0 36 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 37 enum { 38 BR_GROUPFWD_STP = BIT(0), 39 BR_GROUPFWD_MACPAUSE = BIT(1), 40 BR_GROUPFWD_LACP = BIT(2), 41 }; 42 43 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 44 BR_GROUPFWD_LACP) 45 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 46 #define BR_GROUPFWD_8021AD 0xB801u 47 48 /* Path to usermode spanning tree program */ 49 #define BR_STP_PROG "/sbin/bridge-stp" 50 51 typedef struct bridge_id bridge_id; 52 typedef struct mac_addr mac_addr; 53 typedef __u16 port_id; 54 55 struct bridge_id { 56 unsigned char prio[2]; 57 unsigned char addr[ETH_ALEN]; 58 }; 59 60 struct mac_addr { 61 unsigned char addr[ETH_ALEN]; 62 }; 63 64 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 65 /* our own querier */ 66 struct bridge_mcast_own_query { 67 struct timer_list timer; 68 u32 startup_sent; 69 }; 70 71 /* other querier */ 72 struct bridge_mcast_other_query { 73 struct timer_list timer; 74 unsigned long delay_time; 75 }; 76 77 /* selected querier */ 78 struct bridge_mcast_querier { 79 struct br_ip addr; 80 struct net_bridge_port __rcu *port; 81 }; 82 83 /* IGMP/MLD statistics */ 84 struct bridge_mcast_stats { 85 struct br_mcast_stats mstats; 86 struct u64_stats_sync syncp; 87 }; 88 #endif 89 90 struct br_vlan_stats { 91 u64 rx_bytes; 92 u64 rx_packets; 93 u64 tx_bytes; 94 u64 tx_packets; 95 struct u64_stats_sync syncp; 96 }; 97 98 struct br_tunnel_info { 99 __be64 tunnel_id; 100 struct metadata_dst *tunnel_dst; 101 }; 102 103 /* private vlan flags */ 104 enum { 105 BR_VLFLAG_PER_PORT_STATS = BIT(0), 106 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1), 107 }; 108 109 /** 110 * struct net_bridge_vlan - per-vlan entry 111 * 112 * @vnode: rhashtable member 113 * @vid: VLAN id 114 * @flags: bridge vlan flags 115 * @priv_flags: private (in-kernel) bridge vlan flags 116 * @stats: per-cpu VLAN statistics 117 * @br: if MASTER flag set, this points to a bridge struct 118 * @port: if MASTER flag unset, this points to a port struct 119 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 120 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 121 * for this VLAN entry 122 * @vlist: sorted list of VLAN entries 123 * @rcu: used for entry destruction 124 * 125 * This structure is shared between the global per-VLAN entries contained in 126 * the bridge rhashtable and the local per-port per-VLAN entries contained in 127 * the port's rhashtable. The union entries should be interpreted depending on 128 * the entry flags that are set. 129 */ 130 struct net_bridge_vlan { 131 struct rhash_head vnode; 132 struct rhash_head tnode; 133 u16 vid; 134 u16 flags; 135 u16 priv_flags; 136 struct br_vlan_stats __percpu *stats; 137 union { 138 struct net_bridge *br; 139 struct net_bridge_port *port; 140 }; 141 union { 142 refcount_t refcnt; 143 struct net_bridge_vlan *brvlan; 144 }; 145 146 struct br_tunnel_info tinfo; 147 148 struct list_head vlist; 149 150 struct rcu_head rcu; 151 }; 152 153 /** 154 * struct net_bridge_vlan_group 155 * 156 * @vlan_hash: VLAN entry rhashtable 157 * @vlan_list: sorted VLAN entry list 158 * @num_vlans: number of total VLAN entries 159 * @pvid: PVID VLAN id 160 * 161 * IMPORTANT: Be careful when checking if there're VLAN entries using list 162 * primitives because the bridge can have entries in its list which 163 * are just for global context but not for filtering, i.e. they have 164 * the master flag set but not the brentry flag. If you have to check 165 * if there're "real" entries in the bridge please test @num_vlans 166 */ 167 struct net_bridge_vlan_group { 168 struct rhashtable vlan_hash; 169 struct rhashtable tunnel_hash; 170 struct list_head vlan_list; 171 u16 num_vlans; 172 u16 pvid; 173 }; 174 175 struct net_bridge_fdb_key { 176 mac_addr addr; 177 u16 vlan_id; 178 }; 179 180 struct net_bridge_fdb_entry { 181 struct rhash_head rhnode; 182 struct net_bridge_port *dst; 183 184 struct net_bridge_fdb_key key; 185 struct hlist_node fdb_node; 186 unsigned char is_local:1, 187 is_static:1, 188 is_sticky:1, 189 added_by_user:1, 190 added_by_external_learn:1, 191 offloaded:1; 192 193 /* write-heavy members should not affect lookups */ 194 unsigned long updated ____cacheline_aligned_in_smp; 195 unsigned long used; 196 197 struct rcu_head rcu; 198 }; 199 200 #define MDB_PG_FLAGS_PERMANENT BIT(0) 201 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 202 #define MDB_PG_FLAGS_FAST_LEAVE BIT(2) 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 rhash_head rhnode; 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 struct hlist_node mdb_node; 224 }; 225 226 struct net_bridge_port { 227 struct net_bridge *br; 228 struct net_device *dev; 229 struct list_head list; 230 231 unsigned long flags; 232 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 233 struct net_bridge_vlan_group __rcu *vlgrp; 234 #endif 235 struct net_bridge_port __rcu *backup_port; 236 237 /* STP */ 238 u8 priority; 239 u8 state; 240 u16 port_no; 241 unsigned char topology_change_ack; 242 unsigned char config_pending; 243 port_id port_id; 244 port_id designated_port; 245 bridge_id designated_root; 246 bridge_id designated_bridge; 247 u32 path_cost; 248 u32 designated_cost; 249 unsigned long designated_age; 250 251 struct timer_list forward_delay_timer; 252 struct timer_list hold_timer; 253 struct timer_list message_age_timer; 254 struct kobject kobj; 255 struct rcu_head rcu; 256 257 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 258 struct bridge_mcast_own_query ip4_own_query; 259 #if IS_ENABLED(CONFIG_IPV6) 260 struct bridge_mcast_own_query ip6_own_query; 261 #endif /* IS_ENABLED(CONFIG_IPV6) */ 262 unsigned char multicast_router; 263 struct bridge_mcast_stats __percpu *mcast_stats; 264 struct timer_list multicast_router_timer; 265 struct hlist_head mglist; 266 struct hlist_node rlist; 267 #endif 268 269 #ifdef CONFIG_SYSFS 270 char sysfs_name[IFNAMSIZ]; 271 #endif 272 273 #ifdef CONFIG_NET_POLL_CONTROLLER 274 struct netpoll *np; 275 #endif 276 #ifdef CONFIG_NET_SWITCHDEV 277 int offload_fwd_mark; 278 #endif 279 u16 group_fwd_mask; 280 u16 backup_redirected_cnt; 281 }; 282 283 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 284 285 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 286 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 287 288 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 289 { 290 return rcu_dereference(dev->rx_handler_data); 291 } 292 293 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 294 { 295 return netif_is_bridge_port(dev) ? 296 rtnl_dereference(dev->rx_handler_data) : NULL; 297 } 298 299 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 300 { 301 return netif_is_bridge_port(dev) ? 302 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 303 } 304 305 enum net_bridge_opts { 306 BROPT_VLAN_ENABLED, 307 BROPT_VLAN_STATS_ENABLED, 308 BROPT_NF_CALL_IPTABLES, 309 BROPT_NF_CALL_IP6TABLES, 310 BROPT_NF_CALL_ARPTABLES, 311 BROPT_GROUP_ADDR_SET, 312 BROPT_MULTICAST_ENABLED, 313 BROPT_MULTICAST_QUERIER, 314 BROPT_MULTICAST_QUERY_USE_IFADDR, 315 BROPT_MULTICAST_STATS_ENABLED, 316 BROPT_HAS_IPV6_ADDR, 317 BROPT_NEIGH_SUPPRESS_ENABLED, 318 BROPT_MTU_SET_BY_USER, 319 BROPT_VLAN_STATS_PER_PORT, 320 BROPT_NO_LL_LEARN, 321 BROPT_VLAN_BRIDGE_BINDING, 322 }; 323 324 struct net_bridge { 325 spinlock_t lock; 326 spinlock_t hash_lock; 327 struct list_head port_list; 328 struct net_device *dev; 329 struct pcpu_sw_netstats __percpu *stats; 330 unsigned long options; 331 /* These fields are accessed on each packet */ 332 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 333 __be16 vlan_proto; 334 u16 default_pvid; 335 struct net_bridge_vlan_group __rcu *vlgrp; 336 #endif 337 338 struct rhashtable fdb_hash_tbl; 339 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 340 union { 341 struct rtable fake_rtable; 342 struct rt6_info fake_rt6_info; 343 }; 344 #endif 345 u16 group_fwd_mask; 346 u16 group_fwd_mask_required; 347 348 /* STP */ 349 bridge_id designated_root; 350 bridge_id bridge_id; 351 unsigned char topology_change; 352 unsigned char topology_change_detected; 353 u16 root_port; 354 unsigned long max_age; 355 unsigned long hello_time; 356 unsigned long forward_delay; 357 unsigned long ageing_time; 358 unsigned long bridge_max_age; 359 unsigned long bridge_hello_time; 360 unsigned long bridge_forward_delay; 361 unsigned long bridge_ageing_time; 362 u32 root_path_cost; 363 364 u8 group_addr[ETH_ALEN]; 365 366 enum { 367 BR_NO_STP, /* no spanning tree */ 368 BR_KERNEL_STP, /* old STP in kernel */ 369 BR_USER_STP, /* new RSTP in userspace */ 370 } stp_enabled; 371 372 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 373 374 u32 hash_max; 375 376 u32 multicast_last_member_count; 377 u32 multicast_startup_query_count; 378 379 u8 multicast_igmp_version; 380 u8 multicast_router; 381 #if IS_ENABLED(CONFIG_IPV6) 382 u8 multicast_mld_version; 383 #endif 384 spinlock_t multicast_lock; 385 unsigned long multicast_last_member_interval; 386 unsigned long multicast_membership_interval; 387 unsigned long multicast_querier_interval; 388 unsigned long multicast_query_interval; 389 unsigned long multicast_query_response_interval; 390 unsigned long multicast_startup_query_interval; 391 392 struct rhashtable mdb_hash_tbl; 393 394 struct hlist_head mdb_list; 395 struct hlist_head router_list; 396 397 struct timer_list multicast_router_timer; 398 struct bridge_mcast_other_query ip4_other_query; 399 struct bridge_mcast_own_query ip4_own_query; 400 struct bridge_mcast_querier ip4_querier; 401 struct bridge_mcast_stats __percpu *mcast_stats; 402 #if IS_ENABLED(CONFIG_IPV6) 403 struct bridge_mcast_other_query ip6_other_query; 404 struct bridge_mcast_own_query ip6_own_query; 405 struct bridge_mcast_querier ip6_querier; 406 #endif /* IS_ENABLED(CONFIG_IPV6) */ 407 #endif 408 409 struct timer_list hello_timer; 410 struct timer_list tcn_timer; 411 struct timer_list topology_change_timer; 412 struct delayed_work gc_work; 413 struct kobject *ifobj; 414 u32 auto_cnt; 415 416 #ifdef CONFIG_NET_SWITCHDEV 417 int offload_fwd_mark; 418 #endif 419 struct hlist_head fdb_list; 420 }; 421 422 struct br_input_skb_cb { 423 struct net_device *brdev; 424 425 u16 frag_max_size; 426 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 427 u8 igmp; 428 u8 mrouters_only:1; 429 #endif 430 u8 proxyarp_replied:1; 431 u8 src_port_isolated:1; 432 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 433 u8 vlan_filtered:1; 434 #endif 435 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE 436 u8 br_netfilter_broute:1; 437 #endif 438 439 #ifdef CONFIG_NET_SWITCHDEV 440 int offload_fwd_mark; 441 #endif 442 }; 443 444 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 445 446 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 447 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 448 #else 449 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 450 #endif 451 452 #define br_printk(level, br, format, args...) \ 453 printk(level "%s: " format, (br)->dev->name, ##args) 454 455 #define br_err(__br, format, args...) \ 456 br_printk(KERN_ERR, __br, format, ##args) 457 #define br_warn(__br, format, args...) \ 458 br_printk(KERN_WARNING, __br, format, ##args) 459 #define br_notice(__br, format, args...) \ 460 br_printk(KERN_NOTICE, __br, format, ##args) 461 #define br_info(__br, format, args...) \ 462 br_printk(KERN_INFO, __br, format, ##args) 463 464 #define br_debug(br, format, args...) \ 465 pr_debug("%s: " format, (br)->dev->name, ##args) 466 467 /* called under bridge lock */ 468 static inline int br_is_root_bridge(const struct net_bridge *br) 469 { 470 return !memcmp(&br->bridge_id, &br->designated_root, 8); 471 } 472 473 /* check if a VLAN entry is global */ 474 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 475 { 476 return v->flags & BRIDGE_VLAN_INFO_MASTER; 477 } 478 479 /* check if a VLAN entry is used by the bridge */ 480 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 481 { 482 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 483 } 484 485 /* check if we should use the vlan entry, returns false if it's only context */ 486 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 487 { 488 if (br_vlan_is_master(v)) { 489 if (br_vlan_is_brentry(v)) 490 return true; 491 else 492 return false; 493 } 494 495 return true; 496 } 497 498 static inline int br_opt_get(const struct net_bridge *br, 499 enum net_bridge_opts opt) 500 { 501 return test_bit(opt, &br->options); 502 } 503 504 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 505 struct netlink_ext_ack *extack); 506 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 507 int br_boolopt_multi_toggle(struct net_bridge *br, 508 struct br_boolopt_multi *bm, 509 struct netlink_ext_ack *extack); 510 void br_boolopt_multi_get(const struct net_bridge *br, 511 struct br_boolopt_multi *bm); 512 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 513 514 /* br_device.c */ 515 void br_dev_setup(struct net_device *dev); 516 void br_dev_delete(struct net_device *dev, struct list_head *list); 517 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 518 #ifdef CONFIG_NET_POLL_CONTROLLER 519 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 520 struct sk_buff *skb) 521 { 522 struct netpoll *np = p->np; 523 524 if (np) 525 netpoll_send_skb(np, skb); 526 } 527 528 int br_netpoll_enable(struct net_bridge_port *p); 529 void br_netpoll_disable(struct net_bridge_port *p); 530 #else 531 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 532 struct sk_buff *skb) 533 { 534 } 535 536 static inline int br_netpoll_enable(struct net_bridge_port *p) 537 { 538 return 0; 539 } 540 541 static inline void br_netpoll_disable(struct net_bridge_port *p) 542 { 543 } 544 #endif 545 546 /* br_fdb.c */ 547 int br_fdb_init(void); 548 void br_fdb_fini(void); 549 int br_fdb_hash_init(struct net_bridge *br); 550 void br_fdb_hash_fini(struct net_bridge *br); 551 void br_fdb_flush(struct net_bridge *br); 552 void br_fdb_find_delete_local(struct net_bridge *br, 553 const struct net_bridge_port *p, 554 const unsigned char *addr, u16 vid); 555 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 556 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 557 void br_fdb_cleanup(struct work_struct *work); 558 void br_fdb_delete_by_port(struct net_bridge *br, 559 const struct net_bridge_port *p, u16 vid, int do_all); 560 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 561 const unsigned char *addr, 562 __u16 vid); 563 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 564 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 565 unsigned long off); 566 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 567 const unsigned char *addr, u16 vid); 568 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 569 const unsigned char *addr, u16 vid, bool added_by_user); 570 571 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 572 struct net_device *dev, const unsigned char *addr, u16 vid); 573 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 574 const unsigned char *addr, u16 vid, u16 nlh_flags, 575 struct netlink_ext_ack *extack); 576 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 577 struct net_device *dev, struct net_device *fdev, int *idx); 578 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev, 579 const unsigned char *addr, u16 vid, u32 portid, u32 seq, 580 struct netlink_ext_ack *extack); 581 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 582 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 583 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 584 const unsigned char *addr, u16 vid, 585 bool swdev_notify); 586 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 587 const unsigned char *addr, u16 vid, 588 bool swdev_notify); 589 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 590 const unsigned char *addr, u16 vid, bool offloaded); 591 592 /* br_forward.c */ 593 enum br_pkt_type { 594 BR_PKT_UNICAST, 595 BR_PKT_MULTICAST, 596 BR_PKT_BROADCAST 597 }; 598 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 599 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 600 bool local_rcv, bool local_orig); 601 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 602 void br_flood(struct net_bridge *br, struct sk_buff *skb, 603 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 604 605 /* return true if both source port and dest port are isolated */ 606 static inline bool br_skb_isolated(const struct net_bridge_port *to, 607 const struct sk_buff *skb) 608 { 609 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 610 (to->flags & BR_ISOLATED); 611 } 612 613 /* br_if.c */ 614 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 615 int br_add_bridge(struct net *net, const char *name); 616 int br_del_bridge(struct net *net, const char *name); 617 int br_add_if(struct net_bridge *br, struct net_device *dev, 618 struct netlink_ext_ack *extack); 619 int br_del_if(struct net_bridge *br, struct net_device *dev); 620 void br_mtu_auto_adjust(struct net_bridge *br); 621 netdev_features_t br_features_recompute(struct net_bridge *br, 622 netdev_features_t features); 623 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 624 void br_manage_promisc(struct net_bridge *br); 625 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 626 627 /* br_input.c */ 628 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 629 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 630 631 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 632 { 633 return rcu_dereference(dev->rx_handler) == br_handle_frame; 634 } 635 636 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 637 { 638 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 639 } 640 641 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 642 { 643 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 644 } 645 646 static inline struct net_bridge_port * 647 br_port_get_check_rtnl(const struct net_device *dev) 648 { 649 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 650 } 651 652 /* br_ioctl.c */ 653 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 654 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 655 void __user *arg); 656 657 /* br_multicast.c */ 658 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 659 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 660 struct sk_buff *skb, u16 vid); 661 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 662 struct sk_buff *skb, u16 vid); 663 int br_multicast_add_port(struct net_bridge_port *port); 664 void br_multicast_del_port(struct net_bridge_port *port); 665 void br_multicast_enable_port(struct net_bridge_port *port); 666 void br_multicast_disable_port(struct net_bridge_port *port); 667 void br_multicast_init(struct net_bridge *br); 668 void br_multicast_open(struct net_bridge *br); 669 void br_multicast_stop(struct net_bridge *br); 670 void br_multicast_dev_del(struct net_bridge *br); 671 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 672 struct sk_buff *skb, bool local_rcv, bool local_orig); 673 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 674 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 675 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 676 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 677 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 678 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 679 #if IS_ENABLED(CONFIG_IPV6) 680 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 681 #endif 682 struct net_bridge_mdb_entry * 683 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst); 684 struct net_bridge_mdb_entry * 685 br_multicast_new_group(struct net_bridge *br, struct br_ip *group); 686 struct net_bridge_port_group * 687 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 688 struct net_bridge_port_group __rcu *next, 689 unsigned char flags, const unsigned char *src); 690 int br_mdb_hash_init(struct net_bridge *br); 691 void br_mdb_hash_fini(struct net_bridge *br); 692 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 693 struct br_ip *group, int type, u8 flags); 694 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 695 int type); 696 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 697 const struct sk_buff *skb, u8 type, u8 dir); 698 int br_multicast_init_stats(struct net_bridge *br); 699 void br_multicast_uninit_stats(struct net_bridge *br); 700 void br_multicast_get_stats(const struct net_bridge *br, 701 const struct net_bridge_port *p, 702 struct br_mcast_stats *dest); 703 void br_mdb_init(void); 704 void br_mdb_uninit(void); 705 706 #define mlock_dereference(X, br) \ 707 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 708 709 static inline bool br_multicast_is_router(struct net_bridge *br) 710 { 711 return br->multicast_router == 2 || 712 (br->multicast_router == 1 && 713 timer_pending(&br->multicast_router_timer)); 714 } 715 716 static inline bool 717 __br_multicast_querier_exists(struct net_bridge *br, 718 struct bridge_mcast_other_query *querier, 719 const bool is_ipv6) 720 { 721 bool own_querier_enabled; 722 723 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 724 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 725 own_querier_enabled = false; 726 else 727 own_querier_enabled = true; 728 } else { 729 own_querier_enabled = false; 730 } 731 732 return time_is_before_jiffies(querier->delay_time) && 733 (own_querier_enabled || timer_pending(&querier->timer)); 734 } 735 736 static inline bool br_multicast_querier_exists(struct net_bridge *br, 737 struct ethhdr *eth) 738 { 739 switch (eth->h_proto) { 740 case (htons(ETH_P_IP)): 741 return __br_multicast_querier_exists(br, 742 &br->ip4_other_query, false); 743 #if IS_ENABLED(CONFIG_IPV6) 744 case (htons(ETH_P_IPV6)): 745 return __br_multicast_querier_exists(br, 746 &br->ip6_other_query, true); 747 #endif 748 default: 749 return false; 750 } 751 } 752 753 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 754 { 755 return BR_INPUT_SKB_CB(skb)->igmp; 756 } 757 #else 758 static inline int br_multicast_rcv(struct net_bridge *br, 759 struct net_bridge_port *port, 760 struct sk_buff *skb, 761 u16 vid) 762 { 763 return 0; 764 } 765 766 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 767 struct sk_buff *skb, u16 vid) 768 { 769 return NULL; 770 } 771 772 static inline int br_multicast_add_port(struct net_bridge_port *port) 773 { 774 return 0; 775 } 776 777 static inline void br_multicast_del_port(struct net_bridge_port *port) 778 { 779 } 780 781 static inline void br_multicast_enable_port(struct net_bridge_port *port) 782 { 783 } 784 785 static inline void br_multicast_disable_port(struct net_bridge_port *port) 786 { 787 } 788 789 static inline void br_multicast_init(struct net_bridge *br) 790 { 791 } 792 793 static inline void br_multicast_open(struct net_bridge *br) 794 { 795 } 796 797 static inline void br_multicast_stop(struct net_bridge *br) 798 { 799 } 800 801 static inline void br_multicast_dev_del(struct net_bridge *br) 802 { 803 } 804 805 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 806 struct sk_buff *skb, 807 bool local_rcv, bool local_orig) 808 { 809 } 810 811 static inline bool br_multicast_is_router(struct net_bridge *br) 812 { 813 return false; 814 } 815 816 static inline bool br_multicast_querier_exists(struct net_bridge *br, 817 struct ethhdr *eth) 818 { 819 return false; 820 } 821 822 static inline void br_mdb_init(void) 823 { 824 } 825 826 static inline void br_mdb_uninit(void) 827 { 828 } 829 830 static inline int br_mdb_hash_init(struct net_bridge *br) 831 { 832 return 0; 833 } 834 835 static inline void br_mdb_hash_fini(struct net_bridge *br) 836 { 837 } 838 839 static inline void br_multicast_count(struct net_bridge *br, 840 const struct net_bridge_port *p, 841 const struct sk_buff *skb, 842 u8 type, u8 dir) 843 { 844 } 845 846 static inline int br_multicast_init_stats(struct net_bridge *br) 847 { 848 return 0; 849 } 850 851 static inline void br_multicast_uninit_stats(struct net_bridge *br) 852 { 853 } 854 855 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 856 { 857 return 0; 858 } 859 #endif 860 861 /* br_vlan.c */ 862 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 863 bool br_allowed_ingress(const struct net_bridge *br, 864 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 865 u16 *vid); 866 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 867 const struct sk_buff *skb); 868 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 869 struct sk_buff *br_handle_vlan(struct net_bridge *br, 870 const struct net_bridge_port *port, 871 struct net_bridge_vlan_group *vg, 872 struct sk_buff *skb); 873 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 874 bool *changed, struct netlink_ext_ack *extack); 875 int br_vlan_delete(struct net_bridge *br, u16 vid); 876 void br_vlan_flush(struct net_bridge *br); 877 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 878 void br_recalculate_fwd_mask(struct net_bridge *br); 879 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 880 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 881 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 882 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 883 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 884 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 885 int br_vlan_init(struct net_bridge *br); 886 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 887 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 888 struct netlink_ext_ack *extack); 889 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 890 bool *changed, struct netlink_ext_ack *extack); 891 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 892 void nbp_vlan_flush(struct net_bridge_port *port); 893 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack); 894 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 895 void br_vlan_get_stats(const struct net_bridge_vlan *v, 896 struct br_vlan_stats *stats); 897 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event); 898 void br_vlan_bridge_event(struct net_device *dev, unsigned long event, 899 void *ptr); 900 901 static inline struct net_bridge_vlan_group *br_vlan_group( 902 const struct net_bridge *br) 903 { 904 return rtnl_dereference(br->vlgrp); 905 } 906 907 static inline struct net_bridge_vlan_group *nbp_vlan_group( 908 const struct net_bridge_port *p) 909 { 910 return rtnl_dereference(p->vlgrp); 911 } 912 913 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 914 const struct net_bridge *br) 915 { 916 return rcu_dereference(br->vlgrp); 917 } 918 919 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 920 const struct net_bridge_port *p) 921 { 922 return rcu_dereference(p->vlgrp); 923 } 924 925 /* Since bridge now depends on 8021Q module, but the time bridge sees the 926 * skb, the vlan tag will always be present if the frame was tagged. 927 */ 928 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 929 { 930 int err = 0; 931 932 if (skb_vlan_tag_present(skb)) { 933 *vid = skb_vlan_tag_get_id(skb); 934 } else { 935 *vid = 0; 936 err = -EINVAL; 937 } 938 939 return err; 940 } 941 942 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 943 { 944 if (!vg) 945 return 0; 946 947 smp_rmb(); 948 return vg->pvid; 949 } 950 951 #else 952 static inline bool br_allowed_ingress(const struct net_bridge *br, 953 struct net_bridge_vlan_group *vg, 954 struct sk_buff *skb, 955 u16 *vid) 956 { 957 return true; 958 } 959 960 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 961 const struct sk_buff *skb) 962 { 963 return true; 964 } 965 966 static inline bool br_should_learn(struct net_bridge_port *p, 967 struct sk_buff *skb, u16 *vid) 968 { 969 return true; 970 } 971 972 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 973 const struct net_bridge_port *port, 974 struct net_bridge_vlan_group *vg, 975 struct sk_buff *skb) 976 { 977 return skb; 978 } 979 980 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 981 bool *changed, struct netlink_ext_ack *extack) 982 { 983 *changed = false; 984 return -EOPNOTSUPP; 985 } 986 987 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 988 { 989 return -EOPNOTSUPP; 990 } 991 992 static inline void br_vlan_flush(struct net_bridge *br) 993 { 994 } 995 996 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 997 { 998 } 999 1000 static inline int br_vlan_init(struct net_bridge *br) 1001 { 1002 return 0; 1003 } 1004 1005 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1006 bool *changed, struct netlink_ext_ack *extack) 1007 { 1008 *changed = false; 1009 return -EOPNOTSUPP; 1010 } 1011 1012 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1013 { 1014 return -EOPNOTSUPP; 1015 } 1016 1017 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1018 { 1019 } 1020 1021 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1022 u16 vid) 1023 { 1024 return NULL; 1025 } 1026 1027 static inline int nbp_vlan_init(struct net_bridge_port *port, 1028 struct netlink_ext_ack *extack) 1029 { 1030 return 0; 1031 } 1032 1033 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1034 { 1035 return 0; 1036 } 1037 1038 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1039 { 1040 return 0; 1041 } 1042 1043 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1044 unsigned long val) 1045 { 1046 return -EOPNOTSUPP; 1047 } 1048 1049 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1050 u32 filter_mask) 1051 { 1052 return 0; 1053 } 1054 1055 static inline struct net_bridge_vlan_group *br_vlan_group( 1056 const struct net_bridge *br) 1057 { 1058 return NULL; 1059 } 1060 1061 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1062 const struct net_bridge_port *p) 1063 { 1064 return NULL; 1065 } 1066 1067 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1068 const struct net_bridge *br) 1069 { 1070 return NULL; 1071 } 1072 1073 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1074 const struct net_bridge_port *p) 1075 { 1076 return NULL; 1077 } 1078 1079 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1080 struct br_vlan_stats *stats) 1081 { 1082 } 1083 1084 static inline void br_vlan_port_event(struct net_bridge_port *p, 1085 unsigned long event) 1086 { 1087 } 1088 1089 static inline void br_vlan_bridge_event(struct net_device *dev, 1090 unsigned long event, void *ptr) 1091 { 1092 } 1093 #endif 1094 1095 struct nf_br_ops { 1096 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1097 }; 1098 extern const struct nf_br_ops __rcu *nf_br_ops; 1099 1100 /* br_netfilter.c */ 1101 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1102 int br_nf_core_init(void); 1103 void br_nf_core_fini(void); 1104 void br_netfilter_rtable_init(struct net_bridge *); 1105 #else 1106 static inline int br_nf_core_init(void) { return 0; } 1107 static inline void br_nf_core_fini(void) {} 1108 #define br_netfilter_rtable_init(x) 1109 #endif 1110 1111 /* br_stp.c */ 1112 void br_set_state(struct net_bridge_port *p, unsigned int state); 1113 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1114 void br_init_port(struct net_bridge_port *p); 1115 void br_become_designated_port(struct net_bridge_port *p); 1116 1117 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1118 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1119 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1120 int br_set_max_age(struct net_bridge *br, unsigned long x); 1121 int __set_ageing_time(struct net_device *dev, unsigned long t); 1122 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1123 1124 1125 /* br_stp_if.c */ 1126 void br_stp_enable_bridge(struct net_bridge *br); 1127 void br_stp_disable_bridge(struct net_bridge *br); 1128 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1129 void br_stp_enable_port(struct net_bridge_port *p); 1130 void br_stp_disable_port(struct net_bridge_port *p); 1131 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1132 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1133 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1134 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1135 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1136 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1137 1138 /* br_stp_bpdu.c */ 1139 struct stp_proto; 1140 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1141 struct net_device *dev); 1142 1143 /* br_stp_timer.c */ 1144 void br_stp_timer_init(struct net_bridge *br); 1145 void br_stp_port_timer_init(struct net_bridge_port *p); 1146 unsigned long br_timer_value(const struct timer_list *timer); 1147 1148 /* br.c */ 1149 #if IS_ENABLED(CONFIG_ATM_LANE) 1150 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1151 #endif 1152 1153 /* br_netlink.c */ 1154 extern struct rtnl_link_ops br_link_ops; 1155 int br_netlink_init(void); 1156 void br_netlink_fini(void); 1157 void br_ifinfo_notify(int event, const struct net_bridge *br, 1158 const struct net_bridge_port *port); 1159 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags, 1160 struct netlink_ext_ack *extack); 1161 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1162 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1163 u32 filter_mask, int nlflags); 1164 1165 #ifdef CONFIG_SYSFS 1166 /* br_sysfs_if.c */ 1167 extern const struct sysfs_ops brport_sysfs_ops; 1168 int br_sysfs_addif(struct net_bridge_port *p); 1169 int br_sysfs_renameif(struct net_bridge_port *p); 1170 1171 /* br_sysfs_br.c */ 1172 int br_sysfs_addbr(struct net_device *dev); 1173 void br_sysfs_delbr(struct net_device *dev); 1174 1175 #else 1176 1177 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1178 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1179 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1180 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1181 #endif /* CONFIG_SYSFS */ 1182 1183 /* br_switchdev.c */ 1184 #ifdef CONFIG_NET_SWITCHDEV 1185 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1186 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1187 struct sk_buff *skb); 1188 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1189 const struct sk_buff *skb); 1190 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1191 unsigned long flags, 1192 unsigned long mask); 1193 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1194 int type); 1195 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, 1196 struct netlink_ext_ack *extack); 1197 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1198 1199 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1200 { 1201 skb->offload_fwd_mark = 0; 1202 } 1203 #else 1204 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1205 { 1206 return 0; 1207 } 1208 1209 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1210 struct sk_buff *skb) 1211 { 1212 } 1213 1214 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1215 const struct sk_buff *skb) 1216 { 1217 return true; 1218 } 1219 1220 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1221 unsigned long flags, 1222 unsigned long mask) 1223 { 1224 return 0; 1225 } 1226 1227 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1228 u16 vid, u16 flags, 1229 struct netlink_ext_ack *extack) 1230 { 1231 return -EOPNOTSUPP; 1232 } 1233 1234 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1235 { 1236 return -EOPNOTSUPP; 1237 } 1238 1239 static inline void 1240 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1241 { 1242 } 1243 1244 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1245 { 1246 } 1247 #endif /* CONFIG_NET_SWITCHDEV */ 1248 1249 /* br_arp_nd_proxy.c */ 1250 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1251 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1252 u16 vid, struct net_bridge_port *p); 1253 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1254 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1255 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1256 #endif 1257