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