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 struct bridge_stp_xstats stp_xstats; 288 }; 289 290 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 291 292 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 293 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 294 295 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 296 { 297 return rcu_dereference(dev->rx_handler_data); 298 } 299 300 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 301 { 302 return netif_is_bridge_port(dev) ? 303 rtnl_dereference(dev->rx_handler_data) : NULL; 304 } 305 306 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 307 { 308 return netif_is_bridge_port(dev) ? 309 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 310 } 311 312 enum net_bridge_opts { 313 BROPT_VLAN_ENABLED, 314 BROPT_VLAN_STATS_ENABLED, 315 BROPT_NF_CALL_IPTABLES, 316 BROPT_NF_CALL_IP6TABLES, 317 BROPT_NF_CALL_ARPTABLES, 318 BROPT_GROUP_ADDR_SET, 319 BROPT_MULTICAST_ENABLED, 320 BROPT_MULTICAST_QUERIER, 321 BROPT_MULTICAST_QUERY_USE_IFADDR, 322 BROPT_MULTICAST_STATS_ENABLED, 323 BROPT_HAS_IPV6_ADDR, 324 BROPT_NEIGH_SUPPRESS_ENABLED, 325 BROPT_MTU_SET_BY_USER, 326 BROPT_VLAN_STATS_PER_PORT, 327 BROPT_NO_LL_LEARN, 328 BROPT_VLAN_BRIDGE_BINDING, 329 }; 330 331 struct net_bridge { 332 spinlock_t lock; 333 spinlock_t hash_lock; 334 struct list_head port_list; 335 struct net_device *dev; 336 struct pcpu_sw_netstats __percpu *stats; 337 unsigned long options; 338 /* These fields are accessed on each packet */ 339 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 340 __be16 vlan_proto; 341 u16 default_pvid; 342 struct net_bridge_vlan_group __rcu *vlgrp; 343 #endif 344 345 struct rhashtable fdb_hash_tbl; 346 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 347 union { 348 struct rtable fake_rtable; 349 struct rt6_info fake_rt6_info; 350 }; 351 #endif 352 u16 group_fwd_mask; 353 u16 group_fwd_mask_required; 354 355 /* STP */ 356 bridge_id designated_root; 357 bridge_id bridge_id; 358 unsigned char topology_change; 359 unsigned char topology_change_detected; 360 u16 root_port; 361 unsigned long max_age; 362 unsigned long hello_time; 363 unsigned long forward_delay; 364 unsigned long ageing_time; 365 unsigned long bridge_max_age; 366 unsigned long bridge_hello_time; 367 unsigned long bridge_forward_delay; 368 unsigned long bridge_ageing_time; 369 u32 root_path_cost; 370 371 u8 group_addr[ETH_ALEN]; 372 373 enum { 374 BR_NO_STP, /* no spanning tree */ 375 BR_KERNEL_STP, /* old STP in kernel */ 376 BR_USER_STP, /* new RSTP in userspace */ 377 } stp_enabled; 378 379 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 380 381 u32 hash_max; 382 383 u32 multicast_last_member_count; 384 u32 multicast_startup_query_count; 385 386 u8 multicast_igmp_version; 387 u8 multicast_router; 388 #if IS_ENABLED(CONFIG_IPV6) 389 u8 multicast_mld_version; 390 #endif 391 spinlock_t multicast_lock; 392 unsigned long multicast_last_member_interval; 393 unsigned long multicast_membership_interval; 394 unsigned long multicast_querier_interval; 395 unsigned long multicast_query_interval; 396 unsigned long multicast_query_response_interval; 397 unsigned long multicast_startup_query_interval; 398 399 struct rhashtable mdb_hash_tbl; 400 401 struct hlist_head mdb_list; 402 struct hlist_head router_list; 403 404 struct timer_list multicast_router_timer; 405 struct bridge_mcast_other_query ip4_other_query; 406 struct bridge_mcast_own_query ip4_own_query; 407 struct bridge_mcast_querier ip4_querier; 408 struct bridge_mcast_stats __percpu *mcast_stats; 409 #if IS_ENABLED(CONFIG_IPV6) 410 struct bridge_mcast_other_query ip6_other_query; 411 struct bridge_mcast_own_query ip6_own_query; 412 struct bridge_mcast_querier ip6_querier; 413 #endif /* IS_ENABLED(CONFIG_IPV6) */ 414 #endif 415 416 struct timer_list hello_timer; 417 struct timer_list tcn_timer; 418 struct timer_list topology_change_timer; 419 struct delayed_work gc_work; 420 struct kobject *ifobj; 421 u32 auto_cnt; 422 423 #ifdef CONFIG_NET_SWITCHDEV 424 int offload_fwd_mark; 425 #endif 426 struct hlist_head fdb_list; 427 }; 428 429 struct br_input_skb_cb { 430 struct net_device *brdev; 431 432 u16 frag_max_size; 433 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 434 u8 igmp; 435 u8 mrouters_only:1; 436 #endif 437 u8 proxyarp_replied:1; 438 u8 src_port_isolated:1; 439 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 440 u8 vlan_filtered:1; 441 #endif 442 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE 443 u8 br_netfilter_broute:1; 444 #endif 445 446 #ifdef CONFIG_NET_SWITCHDEV 447 int offload_fwd_mark; 448 #endif 449 }; 450 451 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 452 453 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 454 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 455 #else 456 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 457 #endif 458 459 #define br_printk(level, br, format, args...) \ 460 printk(level "%s: " format, (br)->dev->name, ##args) 461 462 #define br_err(__br, format, args...) \ 463 br_printk(KERN_ERR, __br, format, ##args) 464 #define br_warn(__br, format, args...) \ 465 br_printk(KERN_WARNING, __br, format, ##args) 466 #define br_notice(__br, format, args...) \ 467 br_printk(KERN_NOTICE, __br, format, ##args) 468 #define br_info(__br, format, args...) \ 469 br_printk(KERN_INFO, __br, format, ##args) 470 471 #define br_debug(br, format, args...) \ 472 pr_debug("%s: " format, (br)->dev->name, ##args) 473 474 /* called under bridge lock */ 475 static inline int br_is_root_bridge(const struct net_bridge *br) 476 { 477 return !memcmp(&br->bridge_id, &br->designated_root, 8); 478 } 479 480 /* check if a VLAN entry is global */ 481 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 482 { 483 return v->flags & BRIDGE_VLAN_INFO_MASTER; 484 } 485 486 /* check if a VLAN entry is used by the bridge */ 487 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 488 { 489 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 490 } 491 492 /* check if we should use the vlan entry, returns false if it's only context */ 493 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 494 { 495 if (br_vlan_is_master(v)) { 496 if (br_vlan_is_brentry(v)) 497 return true; 498 else 499 return false; 500 } 501 502 return true; 503 } 504 505 static inline bool nbp_state_should_learn(const struct net_bridge_port *p) 506 { 507 return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING; 508 } 509 510 static inline int br_opt_get(const struct net_bridge *br, 511 enum net_bridge_opts opt) 512 { 513 return test_bit(opt, &br->options); 514 } 515 516 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 517 struct netlink_ext_ack *extack); 518 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 519 int br_boolopt_multi_toggle(struct net_bridge *br, 520 struct br_boolopt_multi *bm, 521 struct netlink_ext_ack *extack); 522 void br_boolopt_multi_get(const struct net_bridge *br, 523 struct br_boolopt_multi *bm); 524 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 525 526 /* br_device.c */ 527 void br_dev_setup(struct net_device *dev); 528 void br_dev_delete(struct net_device *dev, struct list_head *list); 529 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 530 #ifdef CONFIG_NET_POLL_CONTROLLER 531 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 532 struct sk_buff *skb) 533 { 534 struct netpoll *np = p->np; 535 536 if (np) 537 netpoll_send_skb(np, skb); 538 } 539 540 int br_netpoll_enable(struct net_bridge_port *p); 541 void br_netpoll_disable(struct net_bridge_port *p); 542 #else 543 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 544 struct sk_buff *skb) 545 { 546 } 547 548 static inline int br_netpoll_enable(struct net_bridge_port *p) 549 { 550 return 0; 551 } 552 553 static inline void br_netpoll_disable(struct net_bridge_port *p) 554 { 555 } 556 #endif 557 558 /* br_fdb.c */ 559 int br_fdb_init(void); 560 void br_fdb_fini(void); 561 int br_fdb_hash_init(struct net_bridge *br); 562 void br_fdb_hash_fini(struct net_bridge *br); 563 void br_fdb_flush(struct net_bridge *br); 564 void br_fdb_find_delete_local(struct net_bridge *br, 565 const struct net_bridge_port *p, 566 const unsigned char *addr, u16 vid); 567 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 568 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 569 void br_fdb_cleanup(struct work_struct *work); 570 void br_fdb_delete_by_port(struct net_bridge *br, 571 const struct net_bridge_port *p, u16 vid, int do_all); 572 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 573 const unsigned char *addr, 574 __u16 vid); 575 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 576 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 577 unsigned long off); 578 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 579 const unsigned char *addr, u16 vid); 580 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 581 const unsigned char *addr, u16 vid, unsigned long flags); 582 583 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 584 struct net_device *dev, const unsigned char *addr, u16 vid); 585 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 586 const unsigned char *addr, u16 vid, u16 nlh_flags, 587 struct netlink_ext_ack *extack); 588 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 589 struct net_device *dev, struct net_device *fdev, int *idx); 590 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev, 591 const unsigned char *addr, u16 vid, u32 portid, u32 seq, 592 struct netlink_ext_ack *extack); 593 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 594 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 595 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 596 const unsigned char *addr, u16 vid, 597 bool swdev_notify); 598 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 599 const unsigned char *addr, u16 vid, 600 bool swdev_notify); 601 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 602 const unsigned char *addr, u16 vid, bool offloaded); 603 604 /* br_forward.c */ 605 enum br_pkt_type { 606 BR_PKT_UNICAST, 607 BR_PKT_MULTICAST, 608 BR_PKT_BROADCAST 609 }; 610 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 611 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 612 bool local_rcv, bool local_orig); 613 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 614 void br_flood(struct net_bridge *br, struct sk_buff *skb, 615 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 616 617 /* return true if both source port and dest port are isolated */ 618 static inline bool br_skb_isolated(const struct net_bridge_port *to, 619 const struct sk_buff *skb) 620 { 621 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 622 (to->flags & BR_ISOLATED); 623 } 624 625 /* br_if.c */ 626 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 627 int br_add_bridge(struct net *net, const char *name); 628 int br_del_bridge(struct net *net, const char *name); 629 int br_add_if(struct net_bridge *br, struct net_device *dev, 630 struct netlink_ext_ack *extack); 631 int br_del_if(struct net_bridge *br, struct net_device *dev); 632 void br_mtu_auto_adjust(struct net_bridge *br); 633 netdev_features_t br_features_recompute(struct net_bridge *br, 634 netdev_features_t features); 635 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 636 void br_manage_promisc(struct net_bridge *br); 637 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 638 639 /* br_input.c */ 640 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 641 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 642 643 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 644 { 645 return rcu_dereference(dev->rx_handler) == br_handle_frame; 646 } 647 648 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 649 { 650 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 651 } 652 653 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 654 { 655 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 656 } 657 658 static inline struct net_bridge_port * 659 br_port_get_check_rtnl(const struct net_device *dev) 660 { 661 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 662 } 663 664 /* br_ioctl.c */ 665 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 666 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 667 void __user *arg); 668 669 /* br_multicast.c */ 670 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 671 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 672 struct sk_buff *skb, u16 vid); 673 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 674 struct sk_buff *skb, u16 vid); 675 int br_multicast_add_port(struct net_bridge_port *port); 676 void br_multicast_del_port(struct net_bridge_port *port); 677 void br_multicast_enable_port(struct net_bridge_port *port); 678 void br_multicast_disable_port(struct net_bridge_port *port); 679 void br_multicast_init(struct net_bridge *br); 680 void br_multicast_open(struct net_bridge *br); 681 void br_multicast_stop(struct net_bridge *br); 682 void br_multicast_dev_del(struct net_bridge *br); 683 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 684 struct sk_buff *skb, bool local_rcv, bool local_orig); 685 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 686 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 687 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 688 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 689 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 690 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 691 #if IS_ENABLED(CONFIG_IPV6) 692 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 693 #endif 694 struct net_bridge_mdb_entry * 695 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst); 696 struct net_bridge_mdb_entry * 697 br_multicast_new_group(struct net_bridge *br, struct br_ip *group); 698 struct net_bridge_port_group * 699 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 700 struct net_bridge_port_group __rcu *next, 701 unsigned char flags, const unsigned char *src); 702 int br_mdb_hash_init(struct net_bridge *br); 703 void br_mdb_hash_fini(struct net_bridge *br); 704 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 705 struct br_ip *group, int type, u8 flags); 706 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 707 int type); 708 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 709 const struct sk_buff *skb, u8 type, u8 dir); 710 int br_multicast_init_stats(struct net_bridge *br); 711 void br_multicast_uninit_stats(struct net_bridge *br); 712 void br_multicast_get_stats(const struct net_bridge *br, 713 const struct net_bridge_port *p, 714 struct br_mcast_stats *dest); 715 void br_mdb_init(void); 716 void br_mdb_uninit(void); 717 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify); 718 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify); 719 720 #define mlock_dereference(X, br) \ 721 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 722 723 static inline bool br_multicast_is_router(struct net_bridge *br) 724 { 725 return br->multicast_router == 2 || 726 (br->multicast_router == 1 && 727 timer_pending(&br->multicast_router_timer)); 728 } 729 730 static inline bool 731 __br_multicast_querier_exists(struct net_bridge *br, 732 struct bridge_mcast_other_query *querier, 733 const bool is_ipv6) 734 { 735 bool own_querier_enabled; 736 737 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 738 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 739 own_querier_enabled = false; 740 else 741 own_querier_enabled = true; 742 } else { 743 own_querier_enabled = false; 744 } 745 746 return time_is_before_jiffies(querier->delay_time) && 747 (own_querier_enabled || timer_pending(&querier->timer)); 748 } 749 750 static inline bool br_multicast_querier_exists(struct net_bridge *br, 751 struct ethhdr *eth) 752 { 753 switch (eth->h_proto) { 754 case (htons(ETH_P_IP)): 755 return __br_multicast_querier_exists(br, 756 &br->ip4_other_query, false); 757 #if IS_ENABLED(CONFIG_IPV6) 758 case (htons(ETH_P_IPV6)): 759 return __br_multicast_querier_exists(br, 760 &br->ip6_other_query, true); 761 #endif 762 default: 763 return false; 764 } 765 } 766 767 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 768 { 769 return BR_INPUT_SKB_CB(skb)->igmp; 770 } 771 #else 772 static inline int br_multicast_rcv(struct net_bridge *br, 773 struct net_bridge_port *port, 774 struct sk_buff *skb, 775 u16 vid) 776 { 777 return 0; 778 } 779 780 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 781 struct sk_buff *skb, u16 vid) 782 { 783 return NULL; 784 } 785 786 static inline int br_multicast_add_port(struct net_bridge_port *port) 787 { 788 return 0; 789 } 790 791 static inline void br_multicast_del_port(struct net_bridge_port *port) 792 { 793 } 794 795 static inline void br_multicast_enable_port(struct net_bridge_port *port) 796 { 797 } 798 799 static inline void br_multicast_disable_port(struct net_bridge_port *port) 800 { 801 } 802 803 static inline void br_multicast_init(struct net_bridge *br) 804 { 805 } 806 807 static inline void br_multicast_open(struct net_bridge *br) 808 { 809 } 810 811 static inline void br_multicast_stop(struct net_bridge *br) 812 { 813 } 814 815 static inline void br_multicast_dev_del(struct net_bridge *br) 816 { 817 } 818 819 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 820 struct sk_buff *skb, 821 bool local_rcv, bool local_orig) 822 { 823 } 824 825 static inline bool br_multicast_is_router(struct net_bridge *br) 826 { 827 return false; 828 } 829 830 static inline bool br_multicast_querier_exists(struct net_bridge *br, 831 struct ethhdr *eth) 832 { 833 return false; 834 } 835 836 static inline void br_mdb_init(void) 837 { 838 } 839 840 static inline void br_mdb_uninit(void) 841 { 842 } 843 844 static inline int br_mdb_hash_init(struct net_bridge *br) 845 { 846 return 0; 847 } 848 849 static inline void br_mdb_hash_fini(struct net_bridge *br) 850 { 851 } 852 853 static inline void br_multicast_count(struct net_bridge *br, 854 const struct net_bridge_port *p, 855 const struct sk_buff *skb, 856 u8 type, u8 dir) 857 { 858 } 859 860 static inline int br_multicast_init_stats(struct net_bridge *br) 861 { 862 return 0; 863 } 864 865 static inline void br_multicast_uninit_stats(struct net_bridge *br) 866 { 867 } 868 869 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 870 { 871 return 0; 872 } 873 #endif 874 875 /* br_vlan.c */ 876 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 877 bool br_allowed_ingress(const struct net_bridge *br, 878 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 879 u16 *vid); 880 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 881 const struct sk_buff *skb); 882 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 883 struct sk_buff *br_handle_vlan(struct net_bridge *br, 884 const struct net_bridge_port *port, 885 struct net_bridge_vlan_group *vg, 886 struct sk_buff *skb); 887 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 888 bool *changed, struct netlink_ext_ack *extack); 889 int br_vlan_delete(struct net_bridge *br, u16 vid); 890 void br_vlan_flush(struct net_bridge *br); 891 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 892 void br_recalculate_fwd_mask(struct net_bridge *br); 893 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 894 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 895 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 896 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 897 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 898 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 899 int br_vlan_init(struct net_bridge *br); 900 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 901 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 902 struct netlink_ext_ack *extack); 903 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 904 bool *changed, struct netlink_ext_ack *extack); 905 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 906 void nbp_vlan_flush(struct net_bridge_port *port); 907 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack); 908 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 909 void br_vlan_get_stats(const struct net_bridge_vlan *v, 910 struct br_vlan_stats *stats); 911 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event); 912 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, 913 void *ptr); 914 915 static inline struct net_bridge_vlan_group *br_vlan_group( 916 const struct net_bridge *br) 917 { 918 return rtnl_dereference(br->vlgrp); 919 } 920 921 static inline struct net_bridge_vlan_group *nbp_vlan_group( 922 const struct net_bridge_port *p) 923 { 924 return rtnl_dereference(p->vlgrp); 925 } 926 927 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 928 const struct net_bridge *br) 929 { 930 return rcu_dereference(br->vlgrp); 931 } 932 933 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 934 const struct net_bridge_port *p) 935 { 936 return rcu_dereference(p->vlgrp); 937 } 938 939 /* Since bridge now depends on 8021Q module, but the time bridge sees the 940 * skb, the vlan tag will always be present if the frame was tagged. 941 */ 942 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 943 { 944 int err = 0; 945 946 if (skb_vlan_tag_present(skb)) { 947 *vid = skb_vlan_tag_get_id(skb); 948 } else { 949 *vid = 0; 950 err = -EINVAL; 951 } 952 953 return err; 954 } 955 956 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 957 { 958 if (!vg) 959 return 0; 960 961 smp_rmb(); 962 return vg->pvid; 963 } 964 965 #else 966 static inline bool br_allowed_ingress(const struct net_bridge *br, 967 struct net_bridge_vlan_group *vg, 968 struct sk_buff *skb, 969 u16 *vid) 970 { 971 return true; 972 } 973 974 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 975 const struct sk_buff *skb) 976 { 977 return true; 978 } 979 980 static inline bool br_should_learn(struct net_bridge_port *p, 981 struct sk_buff *skb, u16 *vid) 982 { 983 return true; 984 } 985 986 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 987 const struct net_bridge_port *port, 988 struct net_bridge_vlan_group *vg, 989 struct sk_buff *skb) 990 { 991 return skb; 992 } 993 994 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 995 bool *changed, struct netlink_ext_ack *extack) 996 { 997 *changed = false; 998 return -EOPNOTSUPP; 999 } 1000 1001 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 1002 { 1003 return -EOPNOTSUPP; 1004 } 1005 1006 static inline void br_vlan_flush(struct net_bridge *br) 1007 { 1008 } 1009 1010 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 1011 { 1012 } 1013 1014 static inline int br_vlan_init(struct net_bridge *br) 1015 { 1016 return 0; 1017 } 1018 1019 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1020 bool *changed, struct netlink_ext_ack *extack) 1021 { 1022 *changed = false; 1023 return -EOPNOTSUPP; 1024 } 1025 1026 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1027 { 1028 return -EOPNOTSUPP; 1029 } 1030 1031 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1032 { 1033 } 1034 1035 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1036 u16 vid) 1037 { 1038 return NULL; 1039 } 1040 1041 static inline int nbp_vlan_init(struct net_bridge_port *port, 1042 struct netlink_ext_ack *extack) 1043 { 1044 return 0; 1045 } 1046 1047 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1048 { 1049 return 0; 1050 } 1051 1052 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1053 { 1054 return 0; 1055 } 1056 1057 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1058 unsigned long val) 1059 { 1060 return -EOPNOTSUPP; 1061 } 1062 1063 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1064 u32 filter_mask) 1065 { 1066 return 0; 1067 } 1068 1069 static inline struct net_bridge_vlan_group *br_vlan_group( 1070 const struct net_bridge *br) 1071 { 1072 return NULL; 1073 } 1074 1075 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1076 const struct net_bridge_port *p) 1077 { 1078 return NULL; 1079 } 1080 1081 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1082 const struct net_bridge *br) 1083 { 1084 return NULL; 1085 } 1086 1087 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1088 const struct net_bridge_port *p) 1089 { 1090 return NULL; 1091 } 1092 1093 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1094 struct br_vlan_stats *stats) 1095 { 1096 } 1097 1098 static inline void br_vlan_port_event(struct net_bridge_port *p, 1099 unsigned long event) 1100 { 1101 } 1102 1103 static inline int br_vlan_bridge_event(struct net_device *dev, 1104 unsigned long event, void *ptr) 1105 { 1106 return 0; 1107 } 1108 #endif 1109 1110 struct nf_br_ops { 1111 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1112 }; 1113 extern const struct nf_br_ops __rcu *nf_br_ops; 1114 1115 /* br_netfilter.c */ 1116 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1117 int br_nf_core_init(void); 1118 void br_nf_core_fini(void); 1119 void br_netfilter_rtable_init(struct net_bridge *); 1120 #else 1121 static inline int br_nf_core_init(void) { return 0; } 1122 static inline void br_nf_core_fini(void) {} 1123 #define br_netfilter_rtable_init(x) 1124 #endif 1125 1126 /* br_stp.c */ 1127 void br_set_state(struct net_bridge_port *p, unsigned int state); 1128 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1129 void br_init_port(struct net_bridge_port *p); 1130 void br_become_designated_port(struct net_bridge_port *p); 1131 1132 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1133 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1134 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1135 int br_set_max_age(struct net_bridge *br, unsigned long x); 1136 int __set_ageing_time(struct net_device *dev, unsigned long t); 1137 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1138 1139 1140 /* br_stp_if.c */ 1141 void br_stp_enable_bridge(struct net_bridge *br); 1142 void br_stp_disable_bridge(struct net_bridge *br); 1143 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1144 void br_stp_enable_port(struct net_bridge_port *p); 1145 void br_stp_disable_port(struct net_bridge_port *p); 1146 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1147 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1148 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1149 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1150 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1151 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1152 1153 /* br_stp_bpdu.c */ 1154 struct stp_proto; 1155 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1156 struct net_device *dev); 1157 1158 /* br_stp_timer.c */ 1159 void br_stp_timer_init(struct net_bridge *br); 1160 void br_stp_port_timer_init(struct net_bridge_port *p); 1161 unsigned long br_timer_value(const struct timer_list *timer); 1162 1163 /* br.c */ 1164 #if IS_ENABLED(CONFIG_ATM_LANE) 1165 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1166 #endif 1167 1168 /* br_netlink.c */ 1169 extern struct rtnl_link_ops br_link_ops; 1170 int br_netlink_init(void); 1171 void br_netlink_fini(void); 1172 void br_ifinfo_notify(int event, const struct net_bridge *br, 1173 const struct net_bridge_port *port); 1174 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags, 1175 struct netlink_ext_ack *extack); 1176 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1177 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1178 u32 filter_mask, int nlflags); 1179 1180 #ifdef CONFIG_SYSFS 1181 /* br_sysfs_if.c */ 1182 extern const struct sysfs_ops brport_sysfs_ops; 1183 int br_sysfs_addif(struct net_bridge_port *p); 1184 int br_sysfs_renameif(struct net_bridge_port *p); 1185 1186 /* br_sysfs_br.c */ 1187 int br_sysfs_addbr(struct net_device *dev); 1188 void br_sysfs_delbr(struct net_device *dev); 1189 1190 #else 1191 1192 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1193 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1194 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1195 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1196 #endif /* CONFIG_SYSFS */ 1197 1198 /* br_switchdev.c */ 1199 #ifdef CONFIG_NET_SWITCHDEV 1200 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1201 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1202 struct sk_buff *skb); 1203 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1204 const struct sk_buff *skb); 1205 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1206 unsigned long flags, 1207 unsigned long mask); 1208 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1209 int type); 1210 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, 1211 struct netlink_ext_ack *extack); 1212 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1213 1214 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1215 { 1216 skb->offload_fwd_mark = 0; 1217 } 1218 #else 1219 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1220 { 1221 return 0; 1222 } 1223 1224 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1225 struct sk_buff *skb) 1226 { 1227 } 1228 1229 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1230 const struct sk_buff *skb) 1231 { 1232 return true; 1233 } 1234 1235 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1236 unsigned long flags, 1237 unsigned long mask) 1238 { 1239 return 0; 1240 } 1241 1242 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1243 u16 vid, u16 flags, 1244 struct netlink_ext_ack *extack) 1245 { 1246 return -EOPNOTSUPP; 1247 } 1248 1249 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1250 { 1251 return -EOPNOTSUPP; 1252 } 1253 1254 static inline void 1255 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1256 { 1257 } 1258 1259 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1260 { 1261 } 1262 #endif /* CONFIG_NET_SWITCHDEV */ 1263 1264 /* br_arp_nd_proxy.c */ 1265 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1266 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1267 u16 vid, struct net_bridge_port *p); 1268 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1269 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1270 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1271 #endif 1272