1 /* 2 * Linux ethernet bridge 3 * 4 * Authors: 5 * Lennert Buytenhek <buytenh@gnu.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _BR_PRIVATE_H 14 #define _BR_PRIVATE_H 15 16 #include <linux/netdevice.h> 17 #include <linux/if_bridge.h> 18 #include <linux/netpoll.h> 19 #include <linux/u64_stats_sync.h> 20 #include <net/route.h> 21 #include <net/ip6_fib.h> 22 #include <linux/if_vlan.h> 23 #include <linux/rhashtable.h> 24 #include <linux/refcount.h> 25 26 #define BR_HASH_BITS 8 27 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 28 29 #define BR_HOLD_TIME (1*HZ) 30 31 #define BR_PORT_BITS 10 32 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 33 34 #define BR_MULTICAST_DEFAULT_HASH_MAX 4096 35 36 #define BR_VERSION "2.3" 37 38 /* Control of forwarding link local multicast */ 39 #define BR_GROUPFWD_DEFAULT 0 40 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 41 enum { 42 BR_GROUPFWD_STP = BIT(0), 43 BR_GROUPFWD_MACPAUSE = BIT(1), 44 BR_GROUPFWD_LACP = BIT(2), 45 }; 46 47 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 48 BR_GROUPFWD_LACP) 49 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 50 #define BR_GROUPFWD_8021AD 0xB801u 51 52 /* Path to usermode spanning tree program */ 53 #define BR_STP_PROG "/sbin/bridge-stp" 54 55 typedef struct bridge_id bridge_id; 56 typedef struct mac_addr mac_addr; 57 typedef __u16 port_id; 58 59 struct bridge_id { 60 unsigned char prio[2]; 61 unsigned char addr[ETH_ALEN]; 62 }; 63 64 struct mac_addr { 65 unsigned char addr[ETH_ALEN]; 66 }; 67 68 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 69 /* our own querier */ 70 struct bridge_mcast_own_query { 71 struct timer_list timer; 72 u32 startup_sent; 73 }; 74 75 /* other querier */ 76 struct bridge_mcast_other_query { 77 struct timer_list timer; 78 unsigned long delay_time; 79 }; 80 81 /* selected querier */ 82 struct bridge_mcast_querier { 83 struct br_ip addr; 84 struct net_bridge_port __rcu *port; 85 }; 86 87 /* IGMP/MLD statistics */ 88 struct bridge_mcast_stats { 89 struct br_mcast_stats mstats; 90 struct u64_stats_sync syncp; 91 }; 92 #endif 93 94 struct br_vlan_stats { 95 u64 rx_bytes; 96 u64 rx_packets; 97 u64 tx_bytes; 98 u64 tx_packets; 99 struct u64_stats_sync syncp; 100 }; 101 102 struct br_tunnel_info { 103 __be64 tunnel_id; 104 struct metadata_dst *tunnel_dst; 105 }; 106 107 /* private vlan flags */ 108 enum { 109 BR_VLFLAG_PER_PORT_STATS = BIT(0), 110 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1), 111 }; 112 113 /** 114 * struct net_bridge_vlan - per-vlan entry 115 * 116 * @vnode: rhashtable member 117 * @vid: VLAN id 118 * @flags: bridge vlan flags 119 * @priv_flags: private (in-kernel) bridge vlan flags 120 * @stats: per-cpu VLAN statistics 121 * @br: if MASTER flag set, this points to a bridge struct 122 * @port: if MASTER flag unset, this points to a port struct 123 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 124 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 125 * for this VLAN entry 126 * @vlist: sorted list of VLAN entries 127 * @rcu: used for entry destruction 128 * 129 * This structure is shared between the global per-VLAN entries contained in 130 * the bridge rhashtable and the local per-port per-VLAN entries contained in 131 * the port's rhashtable. The union entries should be interpreted depending on 132 * the entry flags that are set. 133 */ 134 struct net_bridge_vlan { 135 struct rhash_head vnode; 136 struct rhash_head tnode; 137 u16 vid; 138 u16 flags; 139 u16 priv_flags; 140 struct br_vlan_stats __percpu *stats; 141 union { 142 struct net_bridge *br; 143 struct net_bridge_port *port; 144 }; 145 union { 146 refcount_t refcnt; 147 struct net_bridge_vlan *brvlan; 148 }; 149 150 struct br_tunnel_info tinfo; 151 152 struct list_head vlist; 153 154 struct rcu_head rcu; 155 }; 156 157 /** 158 * struct net_bridge_vlan_group 159 * 160 * @vlan_hash: VLAN entry rhashtable 161 * @vlan_list: sorted VLAN entry list 162 * @num_vlans: number of total VLAN entries 163 * @pvid: PVID VLAN id 164 * 165 * IMPORTANT: Be careful when checking if there're VLAN entries using list 166 * primitives because the bridge can have entries in its list which 167 * are just for global context but not for filtering, i.e. they have 168 * the master flag set but not the brentry flag. If you have to check 169 * if there're "real" entries in the bridge please test @num_vlans 170 */ 171 struct net_bridge_vlan_group { 172 struct rhashtable vlan_hash; 173 struct rhashtable tunnel_hash; 174 struct list_head vlan_list; 175 u16 num_vlans; 176 u16 pvid; 177 }; 178 179 struct net_bridge_fdb_key { 180 mac_addr addr; 181 u16 vlan_id; 182 }; 183 184 struct net_bridge_fdb_entry { 185 struct rhash_head rhnode; 186 struct net_bridge_port *dst; 187 188 struct net_bridge_fdb_key key; 189 struct hlist_node fdb_node; 190 unsigned char is_local:1, 191 is_static:1, 192 is_sticky:1, 193 added_by_user:1, 194 added_by_external_learn:1, 195 offloaded:1; 196 197 /* write-heavy members should not affect lookups */ 198 unsigned long updated ____cacheline_aligned_in_smp; 199 unsigned long used; 200 201 struct rcu_head rcu; 202 }; 203 204 #define MDB_PG_FLAGS_PERMANENT BIT(0) 205 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 206 207 struct net_bridge_port_group { 208 struct net_bridge_port *port; 209 struct net_bridge_port_group __rcu *next; 210 struct hlist_node mglist; 211 struct rcu_head rcu; 212 struct timer_list timer; 213 struct br_ip addr; 214 unsigned char flags; 215 unsigned char eth_addr[ETH_ALEN]; 216 }; 217 218 struct net_bridge_mdb_entry { 219 struct rhash_head rhnode; 220 struct net_bridge *br; 221 struct net_bridge_port_group __rcu *ports; 222 struct rcu_head rcu; 223 struct timer_list timer; 224 struct br_ip addr; 225 bool host_joined; 226 struct hlist_node mdb_node; 227 }; 228 229 struct net_bridge_port { 230 struct net_bridge *br; 231 struct net_device *dev; 232 struct list_head list; 233 234 unsigned long flags; 235 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 236 struct net_bridge_vlan_group __rcu *vlgrp; 237 #endif 238 struct net_bridge_port __rcu *backup_port; 239 240 /* STP */ 241 u8 priority; 242 u8 state; 243 u16 port_no; 244 unsigned char topology_change_ack; 245 unsigned char config_pending; 246 port_id port_id; 247 port_id designated_port; 248 bridge_id designated_root; 249 bridge_id designated_bridge; 250 u32 path_cost; 251 u32 designated_cost; 252 unsigned long designated_age; 253 254 struct timer_list forward_delay_timer; 255 struct timer_list hold_timer; 256 struct timer_list message_age_timer; 257 struct kobject kobj; 258 struct rcu_head rcu; 259 260 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 261 struct bridge_mcast_own_query ip4_own_query; 262 #if IS_ENABLED(CONFIG_IPV6) 263 struct bridge_mcast_own_query ip6_own_query; 264 #endif /* IS_ENABLED(CONFIG_IPV6) */ 265 unsigned char multicast_router; 266 struct bridge_mcast_stats __percpu *mcast_stats; 267 struct timer_list multicast_router_timer; 268 struct hlist_head mglist; 269 struct hlist_node rlist; 270 #endif 271 272 #ifdef CONFIG_SYSFS 273 char sysfs_name[IFNAMSIZ]; 274 #endif 275 276 #ifdef CONFIG_NET_POLL_CONTROLLER 277 struct netpoll *np; 278 #endif 279 #ifdef CONFIG_NET_SWITCHDEV 280 int offload_fwd_mark; 281 #endif 282 u16 group_fwd_mask; 283 u16 backup_redirected_cnt; 284 }; 285 286 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 287 288 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 289 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 290 291 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 292 { 293 return rcu_dereference(dev->rx_handler_data); 294 } 295 296 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 297 { 298 return netif_is_bridge_port(dev) ? 299 rtnl_dereference(dev->rx_handler_data) : NULL; 300 } 301 302 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 303 { 304 return netif_is_bridge_port(dev) ? 305 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 306 } 307 308 enum net_bridge_opts { 309 BROPT_VLAN_ENABLED, 310 BROPT_VLAN_STATS_ENABLED, 311 BROPT_NF_CALL_IPTABLES, 312 BROPT_NF_CALL_IP6TABLES, 313 BROPT_NF_CALL_ARPTABLES, 314 BROPT_GROUP_ADDR_SET, 315 BROPT_MULTICAST_ENABLED, 316 BROPT_MULTICAST_QUERIER, 317 BROPT_MULTICAST_QUERY_USE_IFADDR, 318 BROPT_MULTICAST_STATS_ENABLED, 319 BROPT_HAS_IPV6_ADDR, 320 BROPT_NEIGH_SUPPRESS_ENABLED, 321 BROPT_MTU_SET_BY_USER, 322 BROPT_VLAN_STATS_PER_PORT, 323 BROPT_NO_LL_LEARN, 324 }; 325 326 struct net_bridge { 327 spinlock_t lock; 328 spinlock_t hash_lock; 329 struct list_head port_list; 330 struct net_device *dev; 331 struct pcpu_sw_netstats __percpu *stats; 332 unsigned long options; 333 /* These fields are accessed on each packet */ 334 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 335 __be16 vlan_proto; 336 u16 default_pvid; 337 struct net_bridge_vlan_group __rcu *vlgrp; 338 #endif 339 340 struct rhashtable fdb_hash_tbl; 341 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 342 union { 343 struct rtable fake_rtable; 344 struct rt6_info fake_rt6_info; 345 }; 346 #endif 347 u16 group_fwd_mask; 348 u16 group_fwd_mask_required; 349 350 /* STP */ 351 bridge_id designated_root; 352 bridge_id bridge_id; 353 unsigned char topology_change; 354 unsigned char topology_change_detected; 355 u16 root_port; 356 unsigned long max_age; 357 unsigned long hello_time; 358 unsigned long forward_delay; 359 unsigned long ageing_time; 360 unsigned long bridge_max_age; 361 unsigned long bridge_hello_time; 362 unsigned long bridge_forward_delay; 363 unsigned long bridge_ageing_time; 364 u32 root_path_cost; 365 366 u8 group_addr[ETH_ALEN]; 367 368 enum { 369 BR_NO_STP, /* no spanning tree */ 370 BR_KERNEL_STP, /* old STP in kernel */ 371 BR_USER_STP, /* new RSTP in userspace */ 372 } stp_enabled; 373 374 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 375 376 u32 hash_max; 377 378 u32 multicast_last_member_count; 379 u32 multicast_startup_query_count; 380 381 u8 multicast_igmp_version; 382 u8 multicast_router; 383 #if IS_ENABLED(CONFIG_IPV6) 384 u8 multicast_mld_version; 385 #endif 386 spinlock_t multicast_lock; 387 unsigned long multicast_last_member_interval; 388 unsigned long multicast_membership_interval; 389 unsigned long multicast_querier_interval; 390 unsigned long multicast_query_interval; 391 unsigned long multicast_query_response_interval; 392 unsigned long multicast_startup_query_interval; 393 394 struct rhashtable mdb_hash_tbl; 395 396 struct hlist_head mdb_list; 397 struct hlist_head router_list; 398 399 struct timer_list multicast_router_timer; 400 struct bridge_mcast_other_query ip4_other_query; 401 struct bridge_mcast_own_query ip4_own_query; 402 struct bridge_mcast_querier ip4_querier; 403 struct bridge_mcast_stats __percpu *mcast_stats; 404 #if IS_ENABLED(CONFIG_IPV6) 405 struct bridge_mcast_other_query ip6_other_query; 406 struct bridge_mcast_own_query ip6_own_query; 407 struct bridge_mcast_querier ip6_querier; 408 #endif /* IS_ENABLED(CONFIG_IPV6) */ 409 #endif 410 411 struct timer_list hello_timer; 412 struct timer_list tcn_timer; 413 struct timer_list topology_change_timer; 414 struct delayed_work gc_work; 415 struct kobject *ifobj; 416 u32 auto_cnt; 417 418 #ifdef CONFIG_NET_SWITCHDEV 419 int offload_fwd_mark; 420 #endif 421 struct hlist_head fdb_list; 422 }; 423 424 struct br_input_skb_cb { 425 struct net_device *brdev; 426 427 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 428 int igmp; 429 int mrouters_only; 430 #endif 431 432 bool proxyarp_replied; 433 bool src_port_isolated; 434 435 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 436 bool vlan_filtered; 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); 897 898 static inline struct net_bridge_vlan_group *br_vlan_group( 899 const struct net_bridge *br) 900 { 901 return rtnl_dereference(br->vlgrp); 902 } 903 904 static inline struct net_bridge_vlan_group *nbp_vlan_group( 905 const struct net_bridge_port *p) 906 { 907 return rtnl_dereference(p->vlgrp); 908 } 909 910 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 911 const struct net_bridge *br) 912 { 913 return rcu_dereference(br->vlgrp); 914 } 915 916 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 917 const struct net_bridge_port *p) 918 { 919 return rcu_dereference(p->vlgrp); 920 } 921 922 /* Since bridge now depends on 8021Q module, but the time bridge sees the 923 * skb, the vlan tag will always be present if the frame was tagged. 924 */ 925 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 926 { 927 int err = 0; 928 929 if (skb_vlan_tag_present(skb)) { 930 *vid = skb_vlan_tag_get_id(skb); 931 } else { 932 *vid = 0; 933 err = -EINVAL; 934 } 935 936 return err; 937 } 938 939 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 940 { 941 if (!vg) 942 return 0; 943 944 smp_rmb(); 945 return vg->pvid; 946 } 947 948 #else 949 static inline bool br_allowed_ingress(const struct net_bridge *br, 950 struct net_bridge_vlan_group *vg, 951 struct sk_buff *skb, 952 u16 *vid) 953 { 954 return true; 955 } 956 957 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 958 const struct sk_buff *skb) 959 { 960 return true; 961 } 962 963 static inline bool br_should_learn(struct net_bridge_port *p, 964 struct sk_buff *skb, u16 *vid) 965 { 966 return true; 967 } 968 969 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 970 const struct net_bridge_port *port, 971 struct net_bridge_vlan_group *vg, 972 struct sk_buff *skb) 973 { 974 return skb; 975 } 976 977 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 978 bool *changed, struct netlink_ext_ack *extack) 979 { 980 *changed = false; 981 return -EOPNOTSUPP; 982 } 983 984 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 985 { 986 return -EOPNOTSUPP; 987 } 988 989 static inline void br_vlan_flush(struct net_bridge *br) 990 { 991 } 992 993 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 994 { 995 } 996 997 static inline int br_vlan_init(struct net_bridge *br) 998 { 999 return 0; 1000 } 1001 1002 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1003 bool *changed, struct netlink_ext_ack *extack) 1004 { 1005 *changed = false; 1006 return -EOPNOTSUPP; 1007 } 1008 1009 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1010 { 1011 return -EOPNOTSUPP; 1012 } 1013 1014 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1015 { 1016 } 1017 1018 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1019 u16 vid) 1020 { 1021 return NULL; 1022 } 1023 1024 static inline int nbp_vlan_init(struct net_bridge_port *port, 1025 struct netlink_ext_ack *extack) 1026 { 1027 return 0; 1028 } 1029 1030 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1031 { 1032 return 0; 1033 } 1034 1035 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1036 { 1037 return 0; 1038 } 1039 1040 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1041 unsigned long val) 1042 { 1043 return -EOPNOTSUPP; 1044 } 1045 1046 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1047 u32 filter_mask) 1048 { 1049 return 0; 1050 } 1051 1052 static inline struct net_bridge_vlan_group *br_vlan_group( 1053 const struct net_bridge *br) 1054 { 1055 return NULL; 1056 } 1057 1058 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1059 const struct net_bridge_port *p) 1060 { 1061 return NULL; 1062 } 1063 1064 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1065 const struct net_bridge *br) 1066 { 1067 return NULL; 1068 } 1069 1070 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1071 const struct net_bridge_port *p) 1072 { 1073 return NULL; 1074 } 1075 1076 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1077 struct br_vlan_stats *stats) 1078 { 1079 } 1080 #endif 1081 1082 struct nf_br_ops { 1083 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1084 }; 1085 extern const struct nf_br_ops __rcu *nf_br_ops; 1086 1087 /* br_netfilter.c */ 1088 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1089 int br_nf_core_init(void); 1090 void br_nf_core_fini(void); 1091 void br_netfilter_rtable_init(struct net_bridge *); 1092 #else 1093 static inline int br_nf_core_init(void) { return 0; } 1094 static inline void br_nf_core_fini(void) {} 1095 #define br_netfilter_rtable_init(x) 1096 #endif 1097 1098 /* br_stp.c */ 1099 void br_set_state(struct net_bridge_port *p, unsigned int state); 1100 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1101 void br_init_port(struct net_bridge_port *p); 1102 void br_become_designated_port(struct net_bridge_port *p); 1103 1104 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1105 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1106 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1107 int br_set_max_age(struct net_bridge *br, unsigned long x); 1108 int __set_ageing_time(struct net_device *dev, unsigned long t); 1109 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1110 1111 1112 /* br_stp_if.c */ 1113 void br_stp_enable_bridge(struct net_bridge *br); 1114 void br_stp_disable_bridge(struct net_bridge *br); 1115 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1116 void br_stp_enable_port(struct net_bridge_port *p); 1117 void br_stp_disable_port(struct net_bridge_port *p); 1118 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1119 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1120 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1121 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1122 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1123 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1124 1125 /* br_stp_bpdu.c */ 1126 struct stp_proto; 1127 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1128 struct net_device *dev); 1129 1130 /* br_stp_timer.c */ 1131 void br_stp_timer_init(struct net_bridge *br); 1132 void br_stp_port_timer_init(struct net_bridge_port *p); 1133 unsigned long br_timer_value(const struct timer_list *timer); 1134 1135 /* br.c */ 1136 #if IS_ENABLED(CONFIG_ATM_LANE) 1137 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1138 #endif 1139 1140 /* br_netlink.c */ 1141 extern struct rtnl_link_ops br_link_ops; 1142 int br_netlink_init(void); 1143 void br_netlink_fini(void); 1144 void br_ifinfo_notify(int event, const struct net_bridge *br, 1145 const struct net_bridge_port *port); 1146 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags, 1147 struct netlink_ext_ack *extack); 1148 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1149 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1150 u32 filter_mask, int nlflags); 1151 1152 #ifdef CONFIG_SYSFS 1153 /* br_sysfs_if.c */ 1154 extern const struct sysfs_ops brport_sysfs_ops; 1155 int br_sysfs_addif(struct net_bridge_port *p); 1156 int br_sysfs_renameif(struct net_bridge_port *p); 1157 1158 /* br_sysfs_br.c */ 1159 int br_sysfs_addbr(struct net_device *dev); 1160 void br_sysfs_delbr(struct net_device *dev); 1161 1162 #else 1163 1164 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1165 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1166 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1167 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1168 #endif /* CONFIG_SYSFS */ 1169 1170 /* br_switchdev.c */ 1171 #ifdef CONFIG_NET_SWITCHDEV 1172 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1173 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1174 struct sk_buff *skb); 1175 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1176 const struct sk_buff *skb); 1177 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1178 unsigned long flags, 1179 unsigned long mask); 1180 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1181 int type); 1182 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, 1183 struct netlink_ext_ack *extack); 1184 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1185 1186 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1187 { 1188 skb->offload_fwd_mark = 0; 1189 } 1190 #else 1191 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1192 { 1193 return 0; 1194 } 1195 1196 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1197 struct sk_buff *skb) 1198 { 1199 } 1200 1201 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1202 const struct sk_buff *skb) 1203 { 1204 return true; 1205 } 1206 1207 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1208 unsigned long flags, 1209 unsigned long mask) 1210 { 1211 return 0; 1212 } 1213 1214 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1215 u16 vid, u16 flags, 1216 struct netlink_ext_ack *extack) 1217 { 1218 return -EOPNOTSUPP; 1219 } 1220 1221 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1222 { 1223 return -EOPNOTSUPP; 1224 } 1225 1226 static inline void 1227 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1228 { 1229 } 1230 1231 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1232 { 1233 } 1234 #endif /* CONFIG_NET_SWITCHDEV */ 1235 1236 /* br_arp_nd_proxy.c */ 1237 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1238 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1239 u16 vid, struct net_bridge_port *p); 1240 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1241 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1242 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1243 #endif 1244