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 /* bridge fdb flags */ 176 enum { 177 BR_FDB_LOCAL, 178 BR_FDB_STATIC, 179 BR_FDB_STICKY, 180 BR_FDB_ADDED_BY_USER, 181 BR_FDB_ADDED_BY_EXT_LEARN, 182 BR_FDB_OFFLOADED, 183 }; 184 185 struct net_bridge_fdb_key { 186 mac_addr addr; 187 u16 vlan_id; 188 }; 189 190 struct net_bridge_fdb_entry { 191 struct rhash_head rhnode; 192 struct net_bridge_port *dst; 193 194 struct net_bridge_fdb_key key; 195 struct hlist_node fdb_node; 196 unsigned long flags; 197 198 /* write-heavy members should not affect lookups */ 199 unsigned long updated ____cacheline_aligned_in_smp; 200 unsigned long used; 201 202 struct rcu_head rcu; 203 }; 204 205 #define MDB_PG_FLAGS_PERMANENT BIT(0) 206 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 207 #define MDB_PG_FLAGS_FAST_LEAVE BIT(2) 208 209 struct net_bridge_port_group { 210 struct net_bridge_port *port; 211 struct net_bridge_port_group __rcu *next; 212 struct hlist_node mglist; 213 struct rcu_head rcu; 214 struct timer_list timer; 215 struct br_ip addr; 216 unsigned char flags; 217 unsigned char eth_addr[ETH_ALEN]; 218 }; 219 220 struct net_bridge_mdb_entry { 221 struct rhash_head rhnode; 222 struct net_bridge *br; 223 struct net_bridge_port_group __rcu *ports; 224 struct rcu_head rcu; 225 struct timer_list timer; 226 struct br_ip addr; 227 bool host_joined; 228 struct hlist_node mdb_node; 229 }; 230 231 struct net_bridge_port { 232 struct net_bridge *br; 233 struct net_device *dev; 234 struct list_head list; 235 236 unsigned long flags; 237 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 238 struct net_bridge_vlan_group __rcu *vlgrp; 239 #endif 240 struct net_bridge_port __rcu *backup_port; 241 242 /* STP */ 243 u8 priority; 244 u8 state; 245 u16 port_no; 246 unsigned char topology_change_ack; 247 unsigned char config_pending; 248 port_id port_id; 249 port_id designated_port; 250 bridge_id designated_root; 251 bridge_id designated_bridge; 252 u32 path_cost; 253 u32 designated_cost; 254 unsigned long designated_age; 255 256 struct timer_list forward_delay_timer; 257 struct timer_list hold_timer; 258 struct timer_list message_age_timer; 259 struct kobject kobj; 260 struct rcu_head rcu; 261 262 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 263 struct bridge_mcast_own_query ip4_own_query; 264 #if IS_ENABLED(CONFIG_IPV6) 265 struct bridge_mcast_own_query ip6_own_query; 266 #endif /* IS_ENABLED(CONFIG_IPV6) */ 267 unsigned char multicast_router; 268 struct bridge_mcast_stats __percpu *mcast_stats; 269 struct timer_list multicast_router_timer; 270 struct hlist_head mglist; 271 struct hlist_node rlist; 272 #endif 273 274 #ifdef CONFIG_SYSFS 275 char sysfs_name[IFNAMSIZ]; 276 #endif 277 278 #ifdef CONFIG_NET_POLL_CONTROLLER 279 struct netpoll *np; 280 #endif 281 #ifdef CONFIG_NET_SWITCHDEV 282 int offload_fwd_mark; 283 #endif 284 u16 group_fwd_mask; 285 u16 backup_redirected_cnt; 286 }; 287 288 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 289 290 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 291 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 292 293 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 294 { 295 return rcu_dereference(dev->rx_handler_data); 296 } 297 298 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 299 { 300 return netif_is_bridge_port(dev) ? 301 rtnl_dereference(dev->rx_handler_data) : NULL; 302 } 303 304 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 305 { 306 return netif_is_bridge_port(dev) ? 307 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 308 } 309 310 enum net_bridge_opts { 311 BROPT_VLAN_ENABLED, 312 BROPT_VLAN_STATS_ENABLED, 313 BROPT_NF_CALL_IPTABLES, 314 BROPT_NF_CALL_IP6TABLES, 315 BROPT_NF_CALL_ARPTABLES, 316 BROPT_GROUP_ADDR_SET, 317 BROPT_MULTICAST_ENABLED, 318 BROPT_MULTICAST_QUERIER, 319 BROPT_MULTICAST_QUERY_USE_IFADDR, 320 BROPT_MULTICAST_STATS_ENABLED, 321 BROPT_HAS_IPV6_ADDR, 322 BROPT_NEIGH_SUPPRESS_ENABLED, 323 BROPT_MTU_SET_BY_USER, 324 BROPT_VLAN_STATS_PER_PORT, 325 BROPT_NO_LL_LEARN, 326 BROPT_VLAN_BRIDGE_BINDING, 327 }; 328 329 struct net_bridge { 330 spinlock_t lock; 331 spinlock_t hash_lock; 332 struct list_head port_list; 333 struct net_device *dev; 334 struct pcpu_sw_netstats __percpu *stats; 335 unsigned long options; 336 /* These fields are accessed on each packet */ 337 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 338 __be16 vlan_proto; 339 u16 default_pvid; 340 struct net_bridge_vlan_group __rcu *vlgrp; 341 #endif 342 343 struct rhashtable fdb_hash_tbl; 344 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 345 union { 346 struct rtable fake_rtable; 347 struct rt6_info fake_rt6_info; 348 }; 349 #endif 350 u16 group_fwd_mask; 351 u16 group_fwd_mask_required; 352 353 /* STP */ 354 bridge_id designated_root; 355 bridge_id bridge_id; 356 unsigned char topology_change; 357 unsigned char topology_change_detected; 358 u16 root_port; 359 unsigned long max_age; 360 unsigned long hello_time; 361 unsigned long forward_delay; 362 unsigned long ageing_time; 363 unsigned long bridge_max_age; 364 unsigned long bridge_hello_time; 365 unsigned long bridge_forward_delay; 366 unsigned long bridge_ageing_time; 367 u32 root_path_cost; 368 369 u8 group_addr[ETH_ALEN]; 370 371 enum { 372 BR_NO_STP, /* no spanning tree */ 373 BR_KERNEL_STP, /* old STP in kernel */ 374 BR_USER_STP, /* new RSTP in userspace */ 375 } stp_enabled; 376 377 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 378 379 u32 hash_max; 380 381 u32 multicast_last_member_count; 382 u32 multicast_startup_query_count; 383 384 u8 multicast_igmp_version; 385 u8 multicast_router; 386 #if IS_ENABLED(CONFIG_IPV6) 387 u8 multicast_mld_version; 388 #endif 389 spinlock_t multicast_lock; 390 unsigned long multicast_last_member_interval; 391 unsigned long multicast_membership_interval; 392 unsigned long multicast_querier_interval; 393 unsigned long multicast_query_interval; 394 unsigned long multicast_query_response_interval; 395 unsigned long multicast_startup_query_interval; 396 397 struct rhashtable mdb_hash_tbl; 398 399 struct hlist_head mdb_list; 400 struct hlist_head router_list; 401 402 struct timer_list multicast_router_timer; 403 struct bridge_mcast_other_query ip4_other_query; 404 struct bridge_mcast_own_query ip4_own_query; 405 struct bridge_mcast_querier ip4_querier; 406 struct bridge_mcast_stats __percpu *mcast_stats; 407 #if IS_ENABLED(CONFIG_IPV6) 408 struct bridge_mcast_other_query ip6_other_query; 409 struct bridge_mcast_own_query ip6_own_query; 410 struct bridge_mcast_querier ip6_querier; 411 #endif /* IS_ENABLED(CONFIG_IPV6) */ 412 #endif 413 414 struct timer_list hello_timer; 415 struct timer_list tcn_timer; 416 struct timer_list topology_change_timer; 417 struct delayed_work gc_work; 418 struct kobject *ifobj; 419 u32 auto_cnt; 420 421 #ifdef CONFIG_NET_SWITCHDEV 422 int offload_fwd_mark; 423 #endif 424 struct hlist_head fdb_list; 425 }; 426 427 struct br_input_skb_cb { 428 struct net_device *brdev; 429 430 u16 frag_max_size; 431 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 432 u8 igmp; 433 u8 mrouters_only:1; 434 #endif 435 u8 proxyarp_replied:1; 436 u8 src_port_isolated:1; 437 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 438 u8 vlan_filtered:1; 439 #endif 440 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE 441 u8 br_netfilter_broute:1; 442 #endif 443 444 #ifdef CONFIG_NET_SWITCHDEV 445 int offload_fwd_mark; 446 #endif 447 }; 448 449 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 450 451 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 452 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 453 #else 454 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 455 #endif 456 457 #define br_printk(level, br, format, args...) \ 458 printk(level "%s: " format, (br)->dev->name, ##args) 459 460 #define br_err(__br, format, args...) \ 461 br_printk(KERN_ERR, __br, format, ##args) 462 #define br_warn(__br, format, args...) \ 463 br_printk(KERN_WARNING, __br, format, ##args) 464 #define br_notice(__br, format, args...) \ 465 br_printk(KERN_NOTICE, __br, format, ##args) 466 #define br_info(__br, format, args...) \ 467 br_printk(KERN_INFO, __br, format, ##args) 468 469 #define br_debug(br, format, args...) \ 470 pr_debug("%s: " format, (br)->dev->name, ##args) 471 472 /* called under bridge lock */ 473 static inline int br_is_root_bridge(const struct net_bridge *br) 474 { 475 return !memcmp(&br->bridge_id, &br->designated_root, 8); 476 } 477 478 /* check if a VLAN entry is global */ 479 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 480 { 481 return v->flags & BRIDGE_VLAN_INFO_MASTER; 482 } 483 484 /* check if a VLAN entry is used by the bridge */ 485 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 486 { 487 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 488 } 489 490 /* check if we should use the vlan entry, returns false if it's only context */ 491 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 492 { 493 if (br_vlan_is_master(v)) { 494 if (br_vlan_is_brentry(v)) 495 return true; 496 else 497 return false; 498 } 499 500 return true; 501 } 502 503 static inline bool nbp_state_should_learn(const struct net_bridge_port *p) 504 { 505 return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING; 506 } 507 508 static inline int br_opt_get(const struct net_bridge *br, 509 enum net_bridge_opts opt) 510 { 511 return test_bit(opt, &br->options); 512 } 513 514 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 515 struct netlink_ext_ack *extack); 516 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 517 int br_boolopt_multi_toggle(struct net_bridge *br, 518 struct br_boolopt_multi *bm, 519 struct netlink_ext_ack *extack); 520 void br_boolopt_multi_get(const struct net_bridge *br, 521 struct br_boolopt_multi *bm); 522 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 523 524 /* br_device.c */ 525 void br_dev_setup(struct net_device *dev); 526 void br_dev_delete(struct net_device *dev, struct list_head *list); 527 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 528 #ifdef CONFIG_NET_POLL_CONTROLLER 529 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 530 struct sk_buff *skb) 531 { 532 struct netpoll *np = p->np; 533 534 if (np) 535 netpoll_send_skb(np, skb); 536 } 537 538 int br_netpoll_enable(struct net_bridge_port *p); 539 void br_netpoll_disable(struct net_bridge_port *p); 540 #else 541 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 542 struct sk_buff *skb) 543 { 544 } 545 546 static inline int br_netpoll_enable(struct net_bridge_port *p) 547 { 548 return 0; 549 } 550 551 static inline void br_netpoll_disable(struct net_bridge_port *p) 552 { 553 } 554 #endif 555 556 /* br_fdb.c */ 557 int br_fdb_init(void); 558 void br_fdb_fini(void); 559 int br_fdb_hash_init(struct net_bridge *br); 560 void br_fdb_hash_fini(struct net_bridge *br); 561 void br_fdb_flush(struct net_bridge *br); 562 void br_fdb_find_delete_local(struct net_bridge *br, 563 const struct net_bridge_port *p, 564 const unsigned char *addr, u16 vid); 565 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 566 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 567 void br_fdb_cleanup(struct work_struct *work); 568 void br_fdb_delete_by_port(struct net_bridge *br, 569 const struct net_bridge_port *p, u16 vid, int do_all); 570 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 571 const unsigned char *addr, 572 __u16 vid); 573 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 574 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 575 unsigned long off); 576 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 577 const unsigned char *addr, u16 vid); 578 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 579 const unsigned char *addr, u16 vid, unsigned long flags); 580 581 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 582 struct net_device *dev, const unsigned char *addr, u16 vid); 583 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 584 const unsigned char *addr, u16 vid, u16 nlh_flags, 585 struct netlink_ext_ack *extack); 586 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 587 struct net_device *dev, struct net_device *fdev, int *idx); 588 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev, 589 const unsigned char *addr, u16 vid, u32 portid, u32 seq, 590 struct netlink_ext_ack *extack); 591 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 592 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 593 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 594 const unsigned char *addr, u16 vid, 595 bool swdev_notify); 596 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 597 const unsigned char *addr, u16 vid, 598 bool swdev_notify); 599 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 600 const unsigned char *addr, u16 vid, bool offloaded); 601 602 /* br_forward.c */ 603 enum br_pkt_type { 604 BR_PKT_UNICAST, 605 BR_PKT_MULTICAST, 606 BR_PKT_BROADCAST 607 }; 608 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 609 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 610 bool local_rcv, bool local_orig); 611 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 612 void br_flood(struct net_bridge *br, struct sk_buff *skb, 613 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 614 615 /* return true if both source port and dest port are isolated */ 616 static inline bool br_skb_isolated(const struct net_bridge_port *to, 617 const struct sk_buff *skb) 618 { 619 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 620 (to->flags & BR_ISOLATED); 621 } 622 623 /* br_if.c */ 624 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 625 int br_add_bridge(struct net *net, const char *name); 626 int br_del_bridge(struct net *net, const char *name); 627 int br_add_if(struct net_bridge *br, struct net_device *dev, 628 struct netlink_ext_ack *extack); 629 int br_del_if(struct net_bridge *br, struct net_device *dev); 630 void br_mtu_auto_adjust(struct net_bridge *br); 631 netdev_features_t br_features_recompute(struct net_bridge *br, 632 netdev_features_t features); 633 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 634 void br_manage_promisc(struct net_bridge *br); 635 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 636 637 /* br_input.c */ 638 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 639 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 640 641 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 642 { 643 return rcu_dereference(dev->rx_handler) == br_handle_frame; 644 } 645 646 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 647 { 648 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 649 } 650 651 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 652 { 653 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 654 } 655 656 static inline struct net_bridge_port * 657 br_port_get_check_rtnl(const struct net_device *dev) 658 { 659 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 660 } 661 662 /* br_ioctl.c */ 663 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 664 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 665 void __user *arg); 666 667 /* br_multicast.c */ 668 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 669 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 670 struct sk_buff *skb, u16 vid); 671 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 672 struct sk_buff *skb, u16 vid); 673 int br_multicast_add_port(struct net_bridge_port *port); 674 void br_multicast_del_port(struct net_bridge_port *port); 675 void br_multicast_enable_port(struct net_bridge_port *port); 676 void br_multicast_disable_port(struct net_bridge_port *port); 677 void br_multicast_init(struct net_bridge *br); 678 void br_multicast_open(struct net_bridge *br); 679 void br_multicast_stop(struct net_bridge *br); 680 void br_multicast_dev_del(struct net_bridge *br); 681 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 682 struct sk_buff *skb, bool local_rcv, bool local_orig); 683 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 684 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 685 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 686 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 687 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 688 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 689 #if IS_ENABLED(CONFIG_IPV6) 690 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 691 #endif 692 struct net_bridge_mdb_entry * 693 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst); 694 struct net_bridge_mdb_entry * 695 br_multicast_new_group(struct net_bridge *br, struct br_ip *group); 696 struct net_bridge_port_group * 697 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 698 struct net_bridge_port_group __rcu *next, 699 unsigned char flags, const unsigned char *src); 700 int br_mdb_hash_init(struct net_bridge *br); 701 void br_mdb_hash_fini(struct net_bridge *br); 702 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 703 struct br_ip *group, int type, u8 flags); 704 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 705 int type); 706 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 707 const struct sk_buff *skb, u8 type, u8 dir); 708 int br_multicast_init_stats(struct net_bridge *br); 709 void br_multicast_uninit_stats(struct net_bridge *br); 710 void br_multicast_get_stats(const struct net_bridge *br, 711 const struct net_bridge_port *p, 712 struct br_mcast_stats *dest); 713 void br_mdb_init(void); 714 void br_mdb_uninit(void); 715 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify); 716 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify); 717 718 #define mlock_dereference(X, br) \ 719 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 720 721 static inline bool br_multicast_is_router(struct net_bridge *br) 722 { 723 return br->multicast_router == 2 || 724 (br->multicast_router == 1 && 725 timer_pending(&br->multicast_router_timer)); 726 } 727 728 static inline bool 729 __br_multicast_querier_exists(struct net_bridge *br, 730 struct bridge_mcast_other_query *querier, 731 const bool is_ipv6) 732 { 733 bool own_querier_enabled; 734 735 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 736 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 737 own_querier_enabled = false; 738 else 739 own_querier_enabled = true; 740 } else { 741 own_querier_enabled = false; 742 } 743 744 return time_is_before_jiffies(querier->delay_time) && 745 (own_querier_enabled || timer_pending(&querier->timer)); 746 } 747 748 static inline bool br_multicast_querier_exists(struct net_bridge *br, 749 struct ethhdr *eth) 750 { 751 switch (eth->h_proto) { 752 case (htons(ETH_P_IP)): 753 return __br_multicast_querier_exists(br, 754 &br->ip4_other_query, false); 755 #if IS_ENABLED(CONFIG_IPV6) 756 case (htons(ETH_P_IPV6)): 757 return __br_multicast_querier_exists(br, 758 &br->ip6_other_query, true); 759 #endif 760 default: 761 return false; 762 } 763 } 764 765 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 766 { 767 return BR_INPUT_SKB_CB(skb)->igmp; 768 } 769 #else 770 static inline int br_multicast_rcv(struct net_bridge *br, 771 struct net_bridge_port *port, 772 struct sk_buff *skb, 773 u16 vid) 774 { 775 return 0; 776 } 777 778 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 779 struct sk_buff *skb, u16 vid) 780 { 781 return NULL; 782 } 783 784 static inline int br_multicast_add_port(struct net_bridge_port *port) 785 { 786 return 0; 787 } 788 789 static inline void br_multicast_del_port(struct net_bridge_port *port) 790 { 791 } 792 793 static inline void br_multicast_enable_port(struct net_bridge_port *port) 794 { 795 } 796 797 static inline void br_multicast_disable_port(struct net_bridge_port *port) 798 { 799 } 800 801 static inline void br_multicast_init(struct net_bridge *br) 802 { 803 } 804 805 static inline void br_multicast_open(struct net_bridge *br) 806 { 807 } 808 809 static inline void br_multicast_stop(struct net_bridge *br) 810 { 811 } 812 813 static inline void br_multicast_dev_del(struct net_bridge *br) 814 { 815 } 816 817 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 818 struct sk_buff *skb, 819 bool local_rcv, bool local_orig) 820 { 821 } 822 823 static inline bool br_multicast_is_router(struct net_bridge *br) 824 { 825 return false; 826 } 827 828 static inline bool br_multicast_querier_exists(struct net_bridge *br, 829 struct ethhdr *eth) 830 { 831 return false; 832 } 833 834 static inline void br_mdb_init(void) 835 { 836 } 837 838 static inline void br_mdb_uninit(void) 839 { 840 } 841 842 static inline int br_mdb_hash_init(struct net_bridge *br) 843 { 844 return 0; 845 } 846 847 static inline void br_mdb_hash_fini(struct net_bridge *br) 848 { 849 } 850 851 static inline void br_multicast_count(struct net_bridge *br, 852 const struct net_bridge_port *p, 853 const struct sk_buff *skb, 854 u8 type, u8 dir) 855 { 856 } 857 858 static inline int br_multicast_init_stats(struct net_bridge *br) 859 { 860 return 0; 861 } 862 863 static inline void br_multicast_uninit_stats(struct net_bridge *br) 864 { 865 } 866 867 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 868 { 869 return 0; 870 } 871 #endif 872 873 /* br_vlan.c */ 874 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 875 bool br_allowed_ingress(const struct net_bridge *br, 876 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 877 u16 *vid); 878 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 879 const struct sk_buff *skb); 880 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 881 struct sk_buff *br_handle_vlan(struct net_bridge *br, 882 const struct net_bridge_port *port, 883 struct net_bridge_vlan_group *vg, 884 struct sk_buff *skb); 885 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 886 bool *changed, struct netlink_ext_ack *extack); 887 int br_vlan_delete(struct net_bridge *br, u16 vid); 888 void br_vlan_flush(struct net_bridge *br); 889 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 890 void br_recalculate_fwd_mask(struct net_bridge *br); 891 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 892 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 893 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 894 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 895 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 896 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 897 int br_vlan_init(struct net_bridge *br); 898 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 899 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 900 struct netlink_ext_ack *extack); 901 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 902 bool *changed, struct netlink_ext_ack *extack); 903 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 904 void nbp_vlan_flush(struct net_bridge_port *port); 905 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack); 906 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 907 void br_vlan_get_stats(const struct net_bridge_vlan *v, 908 struct br_vlan_stats *stats); 909 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event); 910 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, 911 void *ptr); 912 913 static inline struct net_bridge_vlan_group *br_vlan_group( 914 const struct net_bridge *br) 915 { 916 return rtnl_dereference(br->vlgrp); 917 } 918 919 static inline struct net_bridge_vlan_group *nbp_vlan_group( 920 const struct net_bridge_port *p) 921 { 922 return rtnl_dereference(p->vlgrp); 923 } 924 925 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 926 const struct net_bridge *br) 927 { 928 return rcu_dereference(br->vlgrp); 929 } 930 931 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 932 const struct net_bridge_port *p) 933 { 934 return rcu_dereference(p->vlgrp); 935 } 936 937 /* Since bridge now depends on 8021Q module, but the time bridge sees the 938 * skb, the vlan tag will always be present if the frame was tagged. 939 */ 940 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 941 { 942 int err = 0; 943 944 if (skb_vlan_tag_present(skb)) { 945 *vid = skb_vlan_tag_get_id(skb); 946 } else { 947 *vid = 0; 948 err = -EINVAL; 949 } 950 951 return err; 952 } 953 954 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 955 { 956 if (!vg) 957 return 0; 958 959 smp_rmb(); 960 return vg->pvid; 961 } 962 963 #else 964 static inline bool br_allowed_ingress(const struct net_bridge *br, 965 struct net_bridge_vlan_group *vg, 966 struct sk_buff *skb, 967 u16 *vid) 968 { 969 return true; 970 } 971 972 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 973 const struct sk_buff *skb) 974 { 975 return true; 976 } 977 978 static inline bool br_should_learn(struct net_bridge_port *p, 979 struct sk_buff *skb, u16 *vid) 980 { 981 return true; 982 } 983 984 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 985 const struct net_bridge_port *port, 986 struct net_bridge_vlan_group *vg, 987 struct sk_buff *skb) 988 { 989 return skb; 990 } 991 992 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 993 bool *changed, struct netlink_ext_ack *extack) 994 { 995 *changed = false; 996 return -EOPNOTSUPP; 997 } 998 999 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 1000 { 1001 return -EOPNOTSUPP; 1002 } 1003 1004 static inline void br_vlan_flush(struct net_bridge *br) 1005 { 1006 } 1007 1008 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 1009 { 1010 } 1011 1012 static inline int br_vlan_init(struct net_bridge *br) 1013 { 1014 return 0; 1015 } 1016 1017 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1018 bool *changed, struct netlink_ext_ack *extack) 1019 { 1020 *changed = false; 1021 return -EOPNOTSUPP; 1022 } 1023 1024 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1025 { 1026 return -EOPNOTSUPP; 1027 } 1028 1029 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1030 { 1031 } 1032 1033 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1034 u16 vid) 1035 { 1036 return NULL; 1037 } 1038 1039 static inline int nbp_vlan_init(struct net_bridge_port *port, 1040 struct netlink_ext_ack *extack) 1041 { 1042 return 0; 1043 } 1044 1045 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1046 { 1047 return 0; 1048 } 1049 1050 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1051 { 1052 return 0; 1053 } 1054 1055 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1056 unsigned long val) 1057 { 1058 return -EOPNOTSUPP; 1059 } 1060 1061 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1062 u32 filter_mask) 1063 { 1064 return 0; 1065 } 1066 1067 static inline struct net_bridge_vlan_group *br_vlan_group( 1068 const struct net_bridge *br) 1069 { 1070 return NULL; 1071 } 1072 1073 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1074 const struct net_bridge_port *p) 1075 { 1076 return NULL; 1077 } 1078 1079 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1080 const struct net_bridge *br) 1081 { 1082 return NULL; 1083 } 1084 1085 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1086 const struct net_bridge_port *p) 1087 { 1088 return NULL; 1089 } 1090 1091 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1092 struct br_vlan_stats *stats) 1093 { 1094 } 1095 1096 static inline void br_vlan_port_event(struct net_bridge_port *p, 1097 unsigned long event) 1098 { 1099 } 1100 1101 static inline int br_vlan_bridge_event(struct net_device *dev, 1102 unsigned long event, void *ptr) 1103 { 1104 return 0; 1105 } 1106 #endif 1107 1108 struct nf_br_ops { 1109 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1110 }; 1111 extern const struct nf_br_ops __rcu *nf_br_ops; 1112 1113 /* br_netfilter.c */ 1114 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1115 int br_nf_core_init(void); 1116 void br_nf_core_fini(void); 1117 void br_netfilter_rtable_init(struct net_bridge *); 1118 #else 1119 static inline int br_nf_core_init(void) { return 0; } 1120 static inline void br_nf_core_fini(void) {} 1121 #define br_netfilter_rtable_init(x) 1122 #endif 1123 1124 /* br_stp.c */ 1125 void br_set_state(struct net_bridge_port *p, unsigned int state); 1126 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1127 void br_init_port(struct net_bridge_port *p); 1128 void br_become_designated_port(struct net_bridge_port *p); 1129 1130 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1131 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1132 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1133 int br_set_max_age(struct net_bridge *br, unsigned long x); 1134 int __set_ageing_time(struct net_device *dev, unsigned long t); 1135 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1136 1137 1138 /* br_stp_if.c */ 1139 void br_stp_enable_bridge(struct net_bridge *br); 1140 void br_stp_disable_bridge(struct net_bridge *br); 1141 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1142 void br_stp_enable_port(struct net_bridge_port *p); 1143 void br_stp_disable_port(struct net_bridge_port *p); 1144 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1145 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1146 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1147 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1148 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1149 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1150 1151 /* br_stp_bpdu.c */ 1152 struct stp_proto; 1153 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1154 struct net_device *dev); 1155 1156 /* br_stp_timer.c */ 1157 void br_stp_timer_init(struct net_bridge *br); 1158 void br_stp_port_timer_init(struct net_bridge_port *p); 1159 unsigned long br_timer_value(const struct timer_list *timer); 1160 1161 /* br.c */ 1162 #if IS_ENABLED(CONFIG_ATM_LANE) 1163 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1164 #endif 1165 1166 /* br_netlink.c */ 1167 extern struct rtnl_link_ops br_link_ops; 1168 int br_netlink_init(void); 1169 void br_netlink_fini(void); 1170 void br_ifinfo_notify(int event, const struct net_bridge *br, 1171 const struct net_bridge_port *port); 1172 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags, 1173 struct netlink_ext_ack *extack); 1174 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1175 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1176 u32 filter_mask, int nlflags); 1177 1178 #ifdef CONFIG_SYSFS 1179 /* br_sysfs_if.c */ 1180 extern const struct sysfs_ops brport_sysfs_ops; 1181 int br_sysfs_addif(struct net_bridge_port *p); 1182 int br_sysfs_renameif(struct net_bridge_port *p); 1183 1184 /* br_sysfs_br.c */ 1185 int br_sysfs_addbr(struct net_device *dev); 1186 void br_sysfs_delbr(struct net_device *dev); 1187 1188 #else 1189 1190 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1191 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1192 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1193 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1194 #endif /* CONFIG_SYSFS */ 1195 1196 /* br_switchdev.c */ 1197 #ifdef CONFIG_NET_SWITCHDEV 1198 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1199 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1200 struct sk_buff *skb); 1201 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1202 const struct sk_buff *skb); 1203 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1204 unsigned long flags, 1205 unsigned long mask); 1206 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1207 int type); 1208 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, 1209 struct netlink_ext_ack *extack); 1210 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1211 1212 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1213 { 1214 skb->offload_fwd_mark = 0; 1215 } 1216 #else 1217 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1218 { 1219 return 0; 1220 } 1221 1222 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1223 struct sk_buff *skb) 1224 { 1225 } 1226 1227 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1228 const struct sk_buff *skb) 1229 { 1230 return true; 1231 } 1232 1233 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1234 unsigned long flags, 1235 unsigned long mask) 1236 { 1237 return 0; 1238 } 1239 1240 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1241 u16 vid, u16 flags, 1242 struct netlink_ext_ack *extack) 1243 { 1244 return -EOPNOTSUPP; 1245 } 1246 1247 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1248 { 1249 return -EOPNOTSUPP; 1250 } 1251 1252 static inline void 1253 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1254 { 1255 } 1256 1257 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1258 { 1259 } 1260 #endif /* CONFIG_NET_SWITCHDEV */ 1261 1262 /* br_arp_nd_proxy.c */ 1263 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1264 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1265 u16 vid, struct net_bridge_port *p); 1266 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1267 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1268 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1269 #endif 1270