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 }; 111 112 /** 113 * struct net_bridge_vlan - per-vlan entry 114 * 115 * @vnode: rhashtable member 116 * @vid: VLAN id 117 * @flags: bridge vlan flags 118 * @priv_flags: private (in-kernel) bridge vlan flags 119 * @stats: per-cpu VLAN statistics 120 * @br: if MASTER flag set, this points to a bridge struct 121 * @port: if MASTER flag unset, this points to a port struct 122 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 123 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 124 * for this VLAN entry 125 * @vlist: sorted list of VLAN entries 126 * @rcu: used for entry destruction 127 * 128 * This structure is shared between the global per-VLAN entries contained in 129 * the bridge rhashtable and the local per-port per-VLAN entries contained in 130 * the port's rhashtable. The union entries should be interpreted depending on 131 * the entry flags that are set. 132 */ 133 struct net_bridge_vlan { 134 struct rhash_head vnode; 135 struct rhash_head tnode; 136 u16 vid; 137 u16 flags; 138 u16 priv_flags; 139 struct br_vlan_stats __percpu *stats; 140 union { 141 struct net_bridge *br; 142 struct net_bridge_port *port; 143 }; 144 union { 145 refcount_t refcnt; 146 struct net_bridge_vlan *brvlan; 147 }; 148 149 struct br_tunnel_info tinfo; 150 151 struct list_head vlist; 152 153 struct rcu_head rcu; 154 }; 155 156 /** 157 * struct net_bridge_vlan_group 158 * 159 * @vlan_hash: VLAN entry rhashtable 160 * @vlan_list: sorted VLAN entry list 161 * @num_vlans: number of total VLAN entries 162 * @pvid: PVID VLAN id 163 * 164 * IMPORTANT: Be careful when checking if there're VLAN entries using list 165 * primitives because the bridge can have entries in its list which 166 * are just for global context but not for filtering, i.e. they have 167 * the master flag set but not the brentry flag. If you have to check 168 * if there're "real" entries in the bridge please test @num_vlans 169 */ 170 struct net_bridge_vlan_group { 171 struct rhashtable vlan_hash; 172 struct rhashtable tunnel_hash; 173 struct list_head vlan_list; 174 u16 num_vlans; 175 u16 pvid; 176 }; 177 178 struct net_bridge_fdb_key { 179 mac_addr addr; 180 u16 vlan_id; 181 }; 182 183 struct net_bridge_fdb_entry { 184 struct rhash_head rhnode; 185 struct net_bridge_port *dst; 186 187 struct net_bridge_fdb_key key; 188 struct hlist_node fdb_node; 189 unsigned char is_local:1, 190 is_static:1, 191 is_sticky:1, 192 added_by_user:1, 193 added_by_external_learn:1, 194 offloaded:1; 195 196 /* write-heavy members should not affect lookups */ 197 unsigned long updated ____cacheline_aligned_in_smp; 198 unsigned long used; 199 200 struct rcu_head rcu; 201 }; 202 203 #define MDB_PG_FLAGS_PERMANENT BIT(0) 204 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 205 206 struct net_bridge_port_group { 207 struct net_bridge_port *port; 208 struct net_bridge_port_group __rcu *next; 209 struct hlist_node mglist; 210 struct rcu_head rcu; 211 struct timer_list timer; 212 struct br_ip addr; 213 unsigned char flags; 214 unsigned char eth_addr[ETH_ALEN]; 215 }; 216 217 struct net_bridge_mdb_entry { 218 struct rhash_head rhnode; 219 struct net_bridge *br; 220 struct net_bridge_port_group __rcu *ports; 221 struct rcu_head rcu; 222 struct timer_list timer; 223 struct br_ip addr; 224 bool host_joined; 225 struct hlist_node mdb_node; 226 }; 227 228 struct net_bridge_port { 229 struct net_bridge *br; 230 struct net_device *dev; 231 struct list_head list; 232 233 unsigned long flags; 234 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 235 struct net_bridge_vlan_group __rcu *vlgrp; 236 #endif 237 struct net_bridge_port __rcu *backup_port; 238 239 /* STP */ 240 u8 priority; 241 u8 state; 242 u16 port_no; 243 unsigned char topology_change_ack; 244 unsigned char config_pending; 245 port_id port_id; 246 port_id designated_port; 247 bridge_id designated_root; 248 bridge_id designated_bridge; 249 u32 path_cost; 250 u32 designated_cost; 251 unsigned long designated_age; 252 253 struct timer_list forward_delay_timer; 254 struct timer_list hold_timer; 255 struct timer_list message_age_timer; 256 struct kobject kobj; 257 struct rcu_head rcu; 258 259 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 260 struct bridge_mcast_own_query ip4_own_query; 261 #if IS_ENABLED(CONFIG_IPV6) 262 struct bridge_mcast_own_query ip6_own_query; 263 #endif /* IS_ENABLED(CONFIG_IPV6) */ 264 unsigned char multicast_router; 265 struct bridge_mcast_stats __percpu *mcast_stats; 266 struct timer_list multicast_router_timer; 267 struct hlist_head mglist; 268 struct hlist_node rlist; 269 #endif 270 271 #ifdef CONFIG_SYSFS 272 char sysfs_name[IFNAMSIZ]; 273 #endif 274 275 #ifdef CONFIG_NET_POLL_CONTROLLER 276 struct netpoll *np; 277 #endif 278 #ifdef CONFIG_NET_SWITCHDEV 279 int offload_fwd_mark; 280 #endif 281 u16 group_fwd_mask; 282 u16 backup_redirected_cnt; 283 }; 284 285 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 286 287 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 288 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 289 290 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 291 292 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 293 { 294 return rcu_dereference(dev->rx_handler_data); 295 } 296 297 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 298 { 299 return br_port_exists(dev) ? 300 rtnl_dereference(dev->rx_handler_data) : NULL; 301 } 302 303 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 304 { 305 return br_port_exists(dev) ? 306 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 307 } 308 309 enum net_bridge_opts { 310 BROPT_VLAN_ENABLED, 311 BROPT_VLAN_STATS_ENABLED, 312 BROPT_NF_CALL_IPTABLES, 313 BROPT_NF_CALL_IP6TABLES, 314 BROPT_NF_CALL_ARPTABLES, 315 BROPT_GROUP_ADDR_SET, 316 BROPT_MULTICAST_ENABLED, 317 BROPT_MULTICAST_QUERIER, 318 BROPT_MULTICAST_QUERY_USE_IFADDR, 319 BROPT_MULTICAST_STATS_ENABLED, 320 BROPT_HAS_IPV6_ADDR, 321 BROPT_NEIGH_SUPPRESS_ENABLED, 322 BROPT_MTU_SET_BY_USER, 323 BROPT_VLAN_STATS_PER_PORT, 324 BROPT_NO_LL_LEARN, 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 int igmp; 430 int mrouters_only; 431 #endif 432 433 bool proxyarp_replied; 434 bool src_port_isolated; 435 436 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 437 bool vlan_filtered; 438 #endif 439 440 #ifdef CONFIG_NET_SWITCHDEV 441 int offload_fwd_mark; 442 #endif 443 }; 444 445 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 446 447 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 448 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 449 #else 450 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 451 #endif 452 453 #define br_printk(level, br, format, args...) \ 454 printk(level "%s: " format, (br)->dev->name, ##args) 455 456 #define br_err(__br, format, args...) \ 457 br_printk(KERN_ERR, __br, format, ##args) 458 #define br_warn(__br, format, args...) \ 459 br_printk(KERN_WARNING, __br, format, ##args) 460 #define br_notice(__br, format, args...) \ 461 br_printk(KERN_NOTICE, __br, format, ##args) 462 #define br_info(__br, format, args...) \ 463 br_printk(KERN_INFO, __br, format, ##args) 464 465 #define br_debug(br, format, args...) \ 466 pr_debug("%s: " format, (br)->dev->name, ##args) 467 468 /* called under bridge lock */ 469 static inline int br_is_root_bridge(const struct net_bridge *br) 470 { 471 return !memcmp(&br->bridge_id, &br->designated_root, 8); 472 } 473 474 /* check if a VLAN entry is global */ 475 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 476 { 477 return v->flags & BRIDGE_VLAN_INFO_MASTER; 478 } 479 480 /* check if a VLAN entry is used by the bridge */ 481 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 482 { 483 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 484 } 485 486 /* check if we should use the vlan entry, returns false if it's only context */ 487 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 488 { 489 if (br_vlan_is_master(v)) { 490 if (br_vlan_is_brentry(v)) 491 return true; 492 else 493 return false; 494 } 495 496 return true; 497 } 498 499 static inline int br_opt_get(const struct net_bridge *br, 500 enum net_bridge_opts opt) 501 { 502 return test_bit(opt, &br->options); 503 } 504 505 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 506 struct netlink_ext_ack *extack); 507 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 508 int br_boolopt_multi_toggle(struct net_bridge *br, 509 struct br_boolopt_multi *bm, 510 struct netlink_ext_ack *extack); 511 void br_boolopt_multi_get(const struct net_bridge *br, 512 struct br_boolopt_multi *bm); 513 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 514 515 /* br_device.c */ 516 void br_dev_setup(struct net_device *dev); 517 void br_dev_delete(struct net_device *dev, struct list_head *list); 518 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 519 #ifdef CONFIG_NET_POLL_CONTROLLER 520 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 521 struct sk_buff *skb) 522 { 523 struct netpoll *np = p->np; 524 525 if (np) 526 netpoll_send_skb(np, skb); 527 } 528 529 int br_netpoll_enable(struct net_bridge_port *p); 530 void br_netpoll_disable(struct net_bridge_port *p); 531 #else 532 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 533 struct sk_buff *skb) 534 { 535 } 536 537 static inline int br_netpoll_enable(struct net_bridge_port *p) 538 { 539 return 0; 540 } 541 542 static inline void br_netpoll_disable(struct net_bridge_port *p) 543 { 544 } 545 #endif 546 547 /* br_fdb.c */ 548 int br_fdb_init(void); 549 void br_fdb_fini(void); 550 int br_fdb_hash_init(struct net_bridge *br); 551 void br_fdb_hash_fini(struct net_bridge *br); 552 void br_fdb_flush(struct net_bridge *br); 553 void br_fdb_find_delete_local(struct net_bridge *br, 554 const struct net_bridge_port *p, 555 const unsigned char *addr, u16 vid); 556 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 557 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 558 void br_fdb_cleanup(struct work_struct *work); 559 void br_fdb_delete_by_port(struct net_bridge *br, 560 const struct net_bridge_port *p, u16 vid, int do_all); 561 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 562 const unsigned char *addr, 563 __u16 vid); 564 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 565 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 566 unsigned long off); 567 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 568 const unsigned char *addr, u16 vid); 569 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 570 const unsigned char *addr, u16 vid, bool added_by_user); 571 572 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 573 struct net_device *dev, const unsigned char *addr, u16 vid); 574 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 575 const unsigned char *addr, u16 vid, u16 nlh_flags); 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