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