1 /* 2 * Linux ethernet bridge 3 * 4 * Authors: 5 * Lennert Buytenhek <buytenh@gnu.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _BR_PRIVATE_H 14 #define _BR_PRIVATE_H 15 16 #include <linux/netdevice.h> 17 #include <linux/if_bridge.h> 18 #include <linux/netpoll.h> 19 #include <linux/u64_stats_sync.h> 20 #include <net/route.h> 21 #include <net/ip6_fib.h> 22 #include <linux/if_vlan.h> 23 #include <linux/rhashtable.h> 24 #include <linux/refcount.h> 25 26 #define BR_HASH_BITS 8 27 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 28 29 #define BR_HOLD_TIME (1*HZ) 30 31 #define BR_PORT_BITS 10 32 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 33 34 #define BR_VERSION "2.3" 35 36 /* Control of forwarding link local multicast */ 37 #define BR_GROUPFWD_DEFAULT 0 38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 39 enum { 40 BR_GROUPFWD_STP = BIT(0), 41 BR_GROUPFWD_MACPAUSE = BIT(1), 42 BR_GROUPFWD_LACP = BIT(2), 43 }; 44 45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 46 BR_GROUPFWD_LACP) 47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 48 #define BR_GROUPFWD_8021AD 0xB801u 49 50 /* Path to usermode spanning tree program */ 51 #define BR_STP_PROG "/sbin/bridge-stp" 52 53 typedef struct bridge_id bridge_id; 54 typedef struct mac_addr mac_addr; 55 typedef __u16 port_id; 56 57 struct bridge_id { 58 unsigned char prio[2]; 59 unsigned char addr[ETH_ALEN]; 60 }; 61 62 struct mac_addr { 63 unsigned char addr[ETH_ALEN]; 64 }; 65 66 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 67 /* our own querier */ 68 struct bridge_mcast_own_query { 69 struct timer_list timer; 70 u32 startup_sent; 71 }; 72 73 /* other querier */ 74 struct bridge_mcast_other_query { 75 struct timer_list timer; 76 unsigned long delay_time; 77 }; 78 79 /* selected querier */ 80 struct bridge_mcast_querier { 81 struct br_ip addr; 82 struct net_bridge_port __rcu *port; 83 }; 84 85 /* IGMP/MLD statistics */ 86 struct bridge_mcast_stats { 87 struct br_mcast_stats mstats; 88 struct u64_stats_sync syncp; 89 }; 90 #endif 91 92 struct br_vlan_stats { 93 u64 rx_bytes; 94 u64 rx_packets; 95 u64 tx_bytes; 96 u64 tx_packets; 97 struct u64_stats_sync syncp; 98 }; 99 100 struct br_tunnel_info { 101 __be64 tunnel_id; 102 struct metadata_dst *tunnel_dst; 103 }; 104 105 /* private vlan flags */ 106 enum { 107 BR_VLFLAG_PER_PORT_STATS = BIT(0), 108 }; 109 110 /** 111 * struct net_bridge_vlan - per-vlan entry 112 * 113 * @vnode: rhashtable member 114 * @vid: VLAN id 115 * @flags: bridge vlan flags 116 * @priv_flags: private (in-kernel) bridge vlan flags 117 * @stats: per-cpu VLAN statistics 118 * @br: if MASTER flag set, this points to a bridge struct 119 * @port: if MASTER flag unset, this points to a port struct 120 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 121 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 122 * for this VLAN entry 123 * @vlist: sorted list of VLAN entries 124 * @rcu: used for entry destruction 125 * 126 * This structure is shared between the global per-VLAN entries contained in 127 * the bridge rhashtable and the local per-port per-VLAN entries contained in 128 * the port's rhashtable. The union entries should be interpreted depending on 129 * the entry flags that are set. 130 */ 131 struct net_bridge_vlan { 132 struct rhash_head vnode; 133 struct rhash_head tnode; 134 u16 vid; 135 u16 flags; 136 u16 priv_flags; 137 struct br_vlan_stats __percpu *stats; 138 union { 139 struct net_bridge *br; 140 struct net_bridge_port *port; 141 }; 142 union { 143 refcount_t refcnt; 144 struct net_bridge_vlan *brvlan; 145 }; 146 147 struct br_tunnel_info tinfo; 148 149 struct list_head vlist; 150 151 struct rcu_head rcu; 152 }; 153 154 /** 155 * struct net_bridge_vlan_group 156 * 157 * @vlan_hash: VLAN entry rhashtable 158 * @vlan_list: sorted VLAN entry list 159 * @num_vlans: number of total VLAN entries 160 * @pvid: PVID VLAN id 161 * 162 * IMPORTANT: Be careful when checking if there're VLAN entries using list 163 * primitives because the bridge can have entries in its list which 164 * are just for global context but not for filtering, i.e. they have 165 * the master flag set but not the brentry flag. If you have to check 166 * if there're "real" entries in the bridge please test @num_vlans 167 */ 168 struct net_bridge_vlan_group { 169 struct rhashtable vlan_hash; 170 struct rhashtable tunnel_hash; 171 struct list_head vlan_list; 172 u16 num_vlans; 173 u16 pvid; 174 }; 175 176 struct net_bridge_fdb_key { 177 mac_addr addr; 178 u16 vlan_id; 179 }; 180 181 struct net_bridge_fdb_entry { 182 struct rhash_head rhnode; 183 struct net_bridge_port *dst; 184 185 struct net_bridge_fdb_key key; 186 struct hlist_node fdb_node; 187 unsigned char is_local:1, 188 is_static:1, 189 is_sticky:1, 190 added_by_user:1, 191 added_by_external_learn:1, 192 offloaded:1; 193 194 /* write-heavy members should not affect lookups */ 195 unsigned long updated ____cacheline_aligned_in_smp; 196 unsigned long used; 197 198 struct rcu_head rcu; 199 }; 200 201 #define MDB_PG_FLAGS_PERMANENT BIT(0) 202 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 203 204 struct net_bridge_port_group { 205 struct net_bridge_port *port; 206 struct net_bridge_port_group __rcu *next; 207 struct hlist_node mglist; 208 struct rcu_head rcu; 209 struct timer_list timer; 210 struct br_ip addr; 211 unsigned char flags; 212 unsigned char eth_addr[ETH_ALEN]; 213 }; 214 215 struct net_bridge_mdb_entry { 216 struct hlist_node hlist[2]; 217 struct net_bridge *br; 218 struct net_bridge_port_group __rcu *ports; 219 struct rcu_head rcu; 220 struct timer_list timer; 221 struct br_ip addr; 222 bool host_joined; 223 }; 224 225 struct net_bridge_mdb_htable { 226 struct hlist_head *mhash; 227 struct rcu_head rcu; 228 struct net_bridge_mdb_htable *old; 229 u32 size; 230 u32 max; 231 u32 secret; 232 u32 ver; 233 }; 234 235 struct net_bridge_port { 236 struct net_bridge *br; 237 struct net_device *dev; 238 struct list_head list; 239 240 unsigned long flags; 241 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 242 struct net_bridge_vlan_group __rcu *vlgrp; 243 #endif 244 struct net_bridge_port __rcu *backup_port; 245 246 /* STP */ 247 u8 priority; 248 u8 state; 249 u16 port_no; 250 unsigned char topology_change_ack; 251 unsigned char config_pending; 252 port_id port_id; 253 port_id designated_port; 254 bridge_id designated_root; 255 bridge_id designated_bridge; 256 u32 path_cost; 257 u32 designated_cost; 258 unsigned long designated_age; 259 260 struct timer_list forward_delay_timer; 261 struct timer_list hold_timer; 262 struct timer_list message_age_timer; 263 struct kobject kobj; 264 struct rcu_head rcu; 265 266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 267 struct bridge_mcast_own_query ip4_own_query; 268 #if IS_ENABLED(CONFIG_IPV6) 269 struct bridge_mcast_own_query ip6_own_query; 270 #endif /* IS_ENABLED(CONFIG_IPV6) */ 271 unsigned char multicast_router; 272 struct bridge_mcast_stats __percpu *mcast_stats; 273 struct timer_list multicast_router_timer; 274 struct hlist_head mglist; 275 struct hlist_node rlist; 276 #endif 277 278 #ifdef CONFIG_SYSFS 279 char sysfs_name[IFNAMSIZ]; 280 #endif 281 282 #ifdef CONFIG_NET_POLL_CONTROLLER 283 struct netpoll *np; 284 #endif 285 #ifdef CONFIG_NET_SWITCHDEV 286 int offload_fwd_mark; 287 #endif 288 u16 group_fwd_mask; 289 u16 backup_redirected_cnt; 290 }; 291 292 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 293 294 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 295 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 296 297 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 298 299 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 300 { 301 return rcu_dereference(dev->rx_handler_data); 302 } 303 304 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 305 { 306 return br_port_exists(dev) ? 307 rtnl_dereference(dev->rx_handler_data) : NULL; 308 } 309 310 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 311 { 312 return br_port_exists(dev) ? 313 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 314 } 315 316 enum net_bridge_opts { 317 BROPT_VLAN_ENABLED, 318 BROPT_VLAN_STATS_ENABLED, 319 BROPT_NF_CALL_IPTABLES, 320 BROPT_NF_CALL_IP6TABLES, 321 BROPT_NF_CALL_ARPTABLES, 322 BROPT_GROUP_ADDR_SET, 323 BROPT_MULTICAST_ENABLED, 324 BROPT_MULTICAST_QUERIER, 325 BROPT_MULTICAST_QUERY_USE_IFADDR, 326 BROPT_MULTICAST_STATS_ENABLED, 327 BROPT_HAS_IPV6_ADDR, 328 BROPT_NEIGH_SUPPRESS_ENABLED, 329 BROPT_MTU_SET_BY_USER, 330 BROPT_VLAN_STATS_PER_PORT, 331 BROPT_NO_LL_LEARN, 332 }; 333 334 struct net_bridge { 335 spinlock_t lock; 336 spinlock_t hash_lock; 337 struct list_head port_list; 338 struct net_device *dev; 339 struct pcpu_sw_netstats __percpu *stats; 340 unsigned long options; 341 /* These fields are accessed on each packet */ 342 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 343 __be16 vlan_proto; 344 u16 default_pvid; 345 struct net_bridge_vlan_group __rcu *vlgrp; 346 #endif 347 348 struct rhashtable fdb_hash_tbl; 349 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 350 union { 351 struct rtable fake_rtable; 352 struct rt6_info fake_rt6_info; 353 }; 354 #endif 355 u16 group_fwd_mask; 356 u16 group_fwd_mask_required; 357 358 /* STP */ 359 bridge_id designated_root; 360 bridge_id bridge_id; 361 unsigned char topology_change; 362 unsigned char topology_change_detected; 363 u16 root_port; 364 unsigned long max_age; 365 unsigned long hello_time; 366 unsigned long forward_delay; 367 unsigned long ageing_time; 368 unsigned long bridge_max_age; 369 unsigned long bridge_hello_time; 370 unsigned long bridge_forward_delay; 371 unsigned long bridge_ageing_time; 372 u32 root_path_cost; 373 374 u8 group_addr[ETH_ALEN]; 375 376 enum { 377 BR_NO_STP, /* no spanning tree */ 378 BR_KERNEL_STP, /* old STP in kernel */ 379 BR_USER_STP, /* new RSTP in userspace */ 380 } stp_enabled; 381 382 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 383 384 u32 hash_elasticity; 385 u32 hash_max; 386 387 u32 multicast_last_member_count; 388 u32 multicast_startup_query_count; 389 390 u8 multicast_igmp_version; 391 u8 multicast_router; 392 #if IS_ENABLED(CONFIG_IPV6) 393 u8 multicast_mld_version; 394 #endif 395 spinlock_t multicast_lock; 396 unsigned long multicast_last_member_interval; 397 unsigned long multicast_membership_interval; 398 unsigned long multicast_querier_interval; 399 unsigned long multicast_query_interval; 400 unsigned long multicast_query_response_interval; 401 unsigned long multicast_startup_query_interval; 402 403 struct net_bridge_mdb_htable __rcu *mdb; 404 struct hlist_head router_list; 405 406 struct timer_list multicast_router_timer; 407 struct bridge_mcast_other_query ip4_other_query; 408 struct bridge_mcast_own_query ip4_own_query; 409 struct bridge_mcast_querier ip4_querier; 410 struct bridge_mcast_stats __percpu *mcast_stats; 411 #if IS_ENABLED(CONFIG_IPV6) 412 struct bridge_mcast_other_query ip6_other_query; 413 struct bridge_mcast_own_query ip6_own_query; 414 struct bridge_mcast_querier ip6_querier; 415 #endif /* IS_ENABLED(CONFIG_IPV6) */ 416 #endif 417 418 struct timer_list hello_timer; 419 struct timer_list tcn_timer; 420 struct timer_list topology_change_timer; 421 struct delayed_work gc_work; 422 struct kobject *ifobj; 423 u32 auto_cnt; 424 425 #ifdef CONFIG_NET_SWITCHDEV 426 int offload_fwd_mark; 427 #endif 428 struct hlist_head fdb_list; 429 }; 430 431 struct br_input_skb_cb { 432 struct net_device *brdev; 433 434 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 435 int igmp; 436 int mrouters_only; 437 #endif 438 439 bool proxyarp_replied; 440 bool src_port_isolated; 441 442 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 443 bool vlan_filtered; 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 int br_opt_get(const struct net_bridge *br, 506 enum net_bridge_opts opt) 507 { 508 return test_bit(opt, &br->options); 509 } 510 511 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 512 struct netlink_ext_ack *extack); 513 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 514 int br_boolopt_multi_toggle(struct net_bridge *br, 515 struct br_boolopt_multi *bm, 516 struct netlink_ext_ack *extack); 517 void br_boolopt_multi_get(const struct net_bridge *br, 518 struct br_boolopt_multi *bm); 519 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 520 521 /* br_device.c */ 522 void br_dev_setup(struct net_device *dev); 523 void br_dev_delete(struct net_device *dev, struct list_head *list); 524 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 525 #ifdef CONFIG_NET_POLL_CONTROLLER 526 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 527 struct sk_buff *skb) 528 { 529 struct netpoll *np = p->np; 530 531 if (np) 532 netpoll_send_skb(np, skb); 533 } 534 535 int br_netpoll_enable(struct net_bridge_port *p); 536 void br_netpoll_disable(struct net_bridge_port *p); 537 #else 538 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 539 struct sk_buff *skb) 540 { 541 } 542 543 static inline int br_netpoll_enable(struct net_bridge_port *p) 544 { 545 return 0; 546 } 547 548 static inline void br_netpoll_disable(struct net_bridge_port *p) 549 { 550 } 551 #endif 552 553 /* br_fdb.c */ 554 int br_fdb_init(void); 555 void br_fdb_fini(void); 556 int br_fdb_hash_init(struct net_bridge *br); 557 void br_fdb_hash_fini(struct net_bridge *br); 558 void br_fdb_flush(struct net_bridge *br); 559 void br_fdb_find_delete_local(struct net_bridge *br, 560 const struct net_bridge_port *p, 561 const unsigned char *addr, u16 vid); 562 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 563 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 564 void br_fdb_cleanup(struct work_struct *work); 565 void br_fdb_delete_by_port(struct net_bridge *br, 566 const struct net_bridge_port *p, u16 vid, int do_all); 567 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 568 const unsigned char *addr, 569 __u16 vid); 570 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 571 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 572 unsigned long off); 573 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 574 const unsigned char *addr, u16 vid); 575 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 576 const unsigned char *addr, u16 vid, bool added_by_user); 577 578 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 579 struct net_device *dev, const unsigned char *addr, u16 vid); 580 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 581 const unsigned char *addr, u16 vid, u16 nlh_flags); 582 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 583 struct net_device *dev, struct net_device *fdev, int *idx); 584 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 585 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 586 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 587 const unsigned char *addr, u16 vid, 588 bool swdev_notify); 589 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 590 const unsigned char *addr, u16 vid, 591 bool swdev_notify); 592 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 593 const unsigned char *addr, u16 vid, bool offloaded); 594 595 /* br_forward.c */ 596 enum br_pkt_type { 597 BR_PKT_UNICAST, 598 BR_PKT_MULTICAST, 599 BR_PKT_BROADCAST 600 }; 601 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 602 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 603 bool local_rcv, bool local_orig); 604 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 605 void br_flood(struct net_bridge *br, struct sk_buff *skb, 606 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 607 608 /* return true if both source port and dest port are isolated */ 609 static inline bool br_skb_isolated(const struct net_bridge_port *to, 610 const struct sk_buff *skb) 611 { 612 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 613 (to->flags & BR_ISOLATED); 614 } 615 616 /* br_if.c */ 617 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 618 int br_add_bridge(struct net *net, const char *name); 619 int br_del_bridge(struct net *net, const char *name); 620 int br_add_if(struct net_bridge *br, struct net_device *dev, 621 struct netlink_ext_ack *extack); 622 int br_del_if(struct net_bridge *br, struct net_device *dev); 623 void br_mtu_auto_adjust(struct net_bridge *br); 624 netdev_features_t br_features_recompute(struct net_bridge *br, 625 netdev_features_t features); 626 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 627 void br_manage_promisc(struct net_bridge *br); 628 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 629 630 /* br_input.c */ 631 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 632 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 633 634 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 635 { 636 return rcu_dereference(dev->rx_handler) == br_handle_frame; 637 } 638 639 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 640 { 641 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 642 } 643 644 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 645 { 646 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 647 } 648 649 static inline struct net_bridge_port * 650 br_port_get_check_rtnl(const struct net_device *dev) 651 { 652 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 653 } 654 655 /* br_ioctl.c */ 656 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 657 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 658 void __user *arg); 659 660 /* br_multicast.c */ 661 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 662 extern unsigned int br_mdb_rehash_seq; 663 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 664 struct sk_buff *skb, u16 vid); 665 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 666 struct sk_buff *skb, u16 vid); 667 int br_multicast_add_port(struct net_bridge_port *port); 668 void br_multicast_del_port(struct net_bridge_port *port); 669 void br_multicast_enable_port(struct net_bridge_port *port); 670 void br_multicast_disable_port(struct net_bridge_port *port); 671 void br_multicast_init(struct net_bridge *br); 672 void br_multicast_open(struct net_bridge *br); 673 void br_multicast_stop(struct net_bridge *br); 674 void br_multicast_dev_del(struct net_bridge *br); 675 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 676 struct sk_buff *skb, bool local_rcv, bool local_orig); 677 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 678 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 679 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 680 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 681 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 682 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 683 #if IS_ENABLED(CONFIG_IPV6) 684 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 685 #endif 686 struct net_bridge_mdb_entry * 687 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 688 struct net_bridge_mdb_entry * 689 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 690 struct br_ip *group); 691 void br_multicast_free_pg(struct rcu_head *head); 692 struct net_bridge_port_group * 693 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 694 struct net_bridge_port_group __rcu *next, 695 unsigned char flags, const unsigned char *src); 696 void br_mdb_init(void); 697 void br_mdb_uninit(void); 698 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 699 struct br_ip *group, int type, u8 flags); 700 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 701 int type); 702 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 703 const struct sk_buff *skb, u8 type, u8 dir); 704 int br_multicast_init_stats(struct net_bridge *br); 705 void br_multicast_uninit_stats(struct net_bridge *br); 706 void br_multicast_get_stats(const struct net_bridge *br, 707 const struct net_bridge_port *p, 708 struct br_mcast_stats *dest); 709 710 #define mlock_dereference(X, br) \ 711 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 712 713 static inline bool br_multicast_is_router(struct net_bridge *br) 714 { 715 return br->multicast_router == 2 || 716 (br->multicast_router == 1 && 717 timer_pending(&br->multicast_router_timer)); 718 } 719 720 static inline bool 721 __br_multicast_querier_exists(struct net_bridge *br, 722 struct bridge_mcast_other_query *querier, 723 const bool is_ipv6) 724 { 725 bool own_querier_enabled; 726 727 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 728 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 729 own_querier_enabled = false; 730 else 731 own_querier_enabled = true; 732 } else { 733 own_querier_enabled = false; 734 } 735 736 return time_is_before_jiffies(querier->delay_time) && 737 (own_querier_enabled || timer_pending(&querier->timer)); 738 } 739 740 static inline bool br_multicast_querier_exists(struct net_bridge *br, 741 struct ethhdr *eth) 742 { 743 switch (eth->h_proto) { 744 case (htons(ETH_P_IP)): 745 return __br_multicast_querier_exists(br, 746 &br->ip4_other_query, false); 747 #if IS_ENABLED(CONFIG_IPV6) 748 case (htons(ETH_P_IPV6)): 749 return __br_multicast_querier_exists(br, 750 &br->ip6_other_query, true); 751 #endif 752 default: 753 return false; 754 } 755 } 756 757 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 758 { 759 return BR_INPUT_SKB_CB(skb)->igmp; 760 } 761 #else 762 static inline int br_multicast_rcv(struct net_bridge *br, 763 struct net_bridge_port *port, 764 struct sk_buff *skb, 765 u16 vid) 766 { 767 return 0; 768 } 769 770 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 771 struct sk_buff *skb, u16 vid) 772 { 773 return NULL; 774 } 775 776 static inline int br_multicast_add_port(struct net_bridge_port *port) 777 { 778 return 0; 779 } 780 781 static inline void br_multicast_del_port(struct net_bridge_port *port) 782 { 783 } 784 785 static inline void br_multicast_enable_port(struct net_bridge_port *port) 786 { 787 } 788 789 static inline void br_multicast_disable_port(struct net_bridge_port *port) 790 { 791 } 792 793 static inline void br_multicast_init(struct net_bridge *br) 794 { 795 } 796 797 static inline void br_multicast_open(struct net_bridge *br) 798 { 799 } 800 801 static inline void br_multicast_stop(struct net_bridge *br) 802 { 803 } 804 805 static inline void br_multicast_dev_del(struct net_bridge *br) 806 { 807 } 808 809 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 810 struct sk_buff *skb, 811 bool local_rcv, bool local_orig) 812 { 813 } 814 815 static inline bool br_multicast_is_router(struct net_bridge *br) 816 { 817 return false; 818 } 819 820 static inline bool br_multicast_querier_exists(struct net_bridge *br, 821 struct ethhdr *eth) 822 { 823 return false; 824 } 825 826 static inline void br_mdb_init(void) 827 { 828 } 829 830 static inline void br_mdb_uninit(void) 831 { 832 } 833 834 static inline void br_multicast_count(struct net_bridge *br, 835 const struct net_bridge_port *p, 836 const struct sk_buff *skb, 837 u8 type, u8 dir) 838 { 839 } 840 841 static inline int br_multicast_init_stats(struct net_bridge *br) 842 { 843 return 0; 844 } 845 846 static inline void br_multicast_uninit_stats(struct net_bridge *br) 847 { 848 } 849 850 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 851 { 852 return 0; 853 } 854 #endif 855 856 /* br_vlan.c */ 857 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 858 bool br_allowed_ingress(const struct net_bridge *br, 859 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 860 u16 *vid); 861 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 862 const struct sk_buff *skb); 863 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 864 struct sk_buff *br_handle_vlan(struct net_bridge *br, 865 const struct net_bridge_port *port, 866 struct net_bridge_vlan_group *vg, 867 struct sk_buff *skb); 868 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 869 bool *changed); 870 int br_vlan_delete(struct net_bridge *br, u16 vid); 871 void br_vlan_flush(struct net_bridge *br); 872 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 873 void br_recalculate_fwd_mask(struct net_bridge *br); 874 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 875 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 876 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 877 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 878 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 879 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 880 int br_vlan_init(struct net_bridge *br); 881 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 882 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 883 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 884 bool *changed); 885 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 886 void nbp_vlan_flush(struct net_bridge_port *port); 887 int nbp_vlan_init(struct net_bridge_port *port); 888 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 889 void br_vlan_get_stats(const struct net_bridge_vlan *v, 890 struct br_vlan_stats *stats); 891 892 static inline struct net_bridge_vlan_group *br_vlan_group( 893 const struct net_bridge *br) 894 { 895 return rtnl_dereference(br->vlgrp); 896 } 897 898 static inline struct net_bridge_vlan_group *nbp_vlan_group( 899 const struct net_bridge_port *p) 900 { 901 return rtnl_dereference(p->vlgrp); 902 } 903 904 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 905 const struct net_bridge *br) 906 { 907 return rcu_dereference(br->vlgrp); 908 } 909 910 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 911 const struct net_bridge_port *p) 912 { 913 return rcu_dereference(p->vlgrp); 914 } 915 916 /* Since bridge now depends on 8021Q module, but the time bridge sees the 917 * skb, the vlan tag will always be present if the frame was tagged. 918 */ 919 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 920 { 921 int err = 0; 922 923 if (skb_vlan_tag_present(skb)) { 924 *vid = skb_vlan_tag_get_id(skb); 925 } else { 926 *vid = 0; 927 err = -EINVAL; 928 } 929 930 return err; 931 } 932 933 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 934 { 935 if (!vg) 936 return 0; 937 938 smp_rmb(); 939 return vg->pvid; 940 } 941 942 #else 943 static inline bool br_allowed_ingress(const struct net_bridge *br, 944 struct net_bridge_vlan_group *vg, 945 struct sk_buff *skb, 946 u16 *vid) 947 { 948 return true; 949 } 950 951 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 952 const struct sk_buff *skb) 953 { 954 return true; 955 } 956 957 static inline bool br_should_learn(struct net_bridge_port *p, 958 struct sk_buff *skb, u16 *vid) 959 { 960 return true; 961 } 962 963 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 964 const struct net_bridge_port *port, 965 struct net_bridge_vlan_group *vg, 966 struct sk_buff *skb) 967 { 968 return skb; 969 } 970 971 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 972 bool *changed) 973 { 974 *changed = false; 975 return -EOPNOTSUPP; 976 } 977 978 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 979 { 980 return -EOPNOTSUPP; 981 } 982 983 static inline void br_vlan_flush(struct net_bridge *br) 984 { 985 } 986 987 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 988 { 989 } 990 991 static inline int br_vlan_init(struct net_bridge *br) 992 { 993 return 0; 994 } 995 996 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 997 bool *changed) 998 { 999 *changed = false; 1000 return -EOPNOTSUPP; 1001 } 1002 1003 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1004 { 1005 return -EOPNOTSUPP; 1006 } 1007 1008 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1009 { 1010 } 1011 1012 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1013 u16 vid) 1014 { 1015 return NULL; 1016 } 1017 1018 static inline int nbp_vlan_init(struct net_bridge_port *port) 1019 { 1020 return 0; 1021 } 1022 1023 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1024 { 1025 return 0; 1026 } 1027 1028 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1029 { 1030 return 0; 1031 } 1032 1033 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1034 unsigned long val) 1035 { 1036 return -EOPNOTSUPP; 1037 } 1038 1039 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1040 u32 filter_mask) 1041 { 1042 return 0; 1043 } 1044 1045 static inline struct net_bridge_vlan_group *br_vlan_group( 1046 const struct net_bridge *br) 1047 { 1048 return NULL; 1049 } 1050 1051 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1052 const struct net_bridge_port *p) 1053 { 1054 return NULL; 1055 } 1056 1057 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1058 const struct net_bridge *br) 1059 { 1060 return NULL; 1061 } 1062 1063 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1064 const struct net_bridge_port *p) 1065 { 1066 return NULL; 1067 } 1068 1069 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1070 struct br_vlan_stats *stats) 1071 { 1072 } 1073 #endif 1074 1075 struct nf_br_ops { 1076 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1077 }; 1078 extern const struct nf_br_ops __rcu *nf_br_ops; 1079 1080 /* br_netfilter.c */ 1081 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1082 int br_nf_core_init(void); 1083 void br_nf_core_fini(void); 1084 void br_netfilter_rtable_init(struct net_bridge *); 1085 #else 1086 static inline int br_nf_core_init(void) { return 0; } 1087 static inline void br_nf_core_fini(void) {} 1088 #define br_netfilter_rtable_init(x) 1089 #endif 1090 1091 /* br_stp.c */ 1092 void br_set_state(struct net_bridge_port *p, unsigned int state); 1093 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1094 void br_init_port(struct net_bridge_port *p); 1095 void br_become_designated_port(struct net_bridge_port *p); 1096 1097 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1098 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1099 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1100 int br_set_max_age(struct net_bridge *br, unsigned long x); 1101 int __set_ageing_time(struct net_device *dev, unsigned long t); 1102 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1103 1104 1105 /* br_stp_if.c */ 1106 void br_stp_enable_bridge(struct net_bridge *br); 1107 void br_stp_disable_bridge(struct net_bridge *br); 1108 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1109 void br_stp_enable_port(struct net_bridge_port *p); 1110 void br_stp_disable_port(struct net_bridge_port *p); 1111 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1112 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1113 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1114 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1115 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1116 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1117 1118 /* br_stp_bpdu.c */ 1119 struct stp_proto; 1120 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1121 struct net_device *dev); 1122 1123 /* br_stp_timer.c */ 1124 void br_stp_timer_init(struct net_bridge *br); 1125 void br_stp_port_timer_init(struct net_bridge_port *p); 1126 unsigned long br_timer_value(const struct timer_list *timer); 1127 1128 /* br.c */ 1129 #if IS_ENABLED(CONFIG_ATM_LANE) 1130 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1131 #endif 1132 1133 /* br_netlink.c */ 1134 extern struct rtnl_link_ops br_link_ops; 1135 int br_netlink_init(void); 1136 void br_netlink_fini(void); 1137 void br_ifinfo_notify(int event, const struct net_bridge *br, 1138 const struct net_bridge_port *port); 1139 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1140 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1141 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1142 u32 filter_mask, int nlflags); 1143 1144 #ifdef CONFIG_SYSFS 1145 /* br_sysfs_if.c */ 1146 extern const struct sysfs_ops brport_sysfs_ops; 1147 int br_sysfs_addif(struct net_bridge_port *p); 1148 int br_sysfs_renameif(struct net_bridge_port *p); 1149 1150 /* br_sysfs_br.c */ 1151 int br_sysfs_addbr(struct net_device *dev); 1152 void br_sysfs_delbr(struct net_device *dev); 1153 1154 #else 1155 1156 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1157 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1158 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1159 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1160 #endif /* CONFIG_SYSFS */ 1161 1162 /* br_switchdev.c */ 1163 #ifdef CONFIG_NET_SWITCHDEV 1164 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1165 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1166 struct sk_buff *skb); 1167 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1168 const struct sk_buff *skb); 1169 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1170 unsigned long flags, 1171 unsigned long mask); 1172 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1173 int type); 1174 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags); 1175 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1176 1177 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1178 { 1179 skb->offload_fwd_mark = 0; 1180 } 1181 #else 1182 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1183 { 1184 return 0; 1185 } 1186 1187 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1188 struct sk_buff *skb) 1189 { 1190 } 1191 1192 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1193 const struct sk_buff *skb) 1194 { 1195 return true; 1196 } 1197 1198 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1199 unsigned long flags, 1200 unsigned long mask) 1201 { 1202 return 0; 1203 } 1204 1205 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1206 u16 vid, u16 flags) 1207 { 1208 return -EOPNOTSUPP; 1209 } 1210 1211 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1212 { 1213 return -EOPNOTSUPP; 1214 } 1215 1216 static inline void 1217 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1218 { 1219 } 1220 1221 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1222 { 1223 } 1224 #endif /* CONFIG_NET_SWITCHDEV */ 1225 1226 /* br_arp_nd_proxy.c */ 1227 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1228 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1229 u16 vid, struct net_bridge_port *p); 1230 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1231 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1232 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1233 #endif 1234