1 /* 2 * Linux ethernet bridge 3 * 4 * Authors: 5 * Lennert Buytenhek <buytenh@gnu.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _BR_PRIVATE_H 14 #define _BR_PRIVATE_H 15 16 #include <linux/netdevice.h> 17 #include <linux/if_bridge.h> 18 #include <linux/netpoll.h> 19 #include <linux/u64_stats_sync.h> 20 #include <net/route.h> 21 #include <net/ip6_fib.h> 22 #include <linux/if_vlan.h> 23 #include <linux/rhashtable.h> 24 #include <linux/refcount.h> 25 26 #define BR_HASH_BITS 8 27 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 28 29 #define BR_HOLD_TIME (1*HZ) 30 31 #define BR_PORT_BITS 10 32 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 33 34 #define BR_MULTICAST_DEFAULT_HASH_MAX 4096 35 36 #define BR_VERSION "2.3" 37 38 /* Control of forwarding link local multicast */ 39 #define BR_GROUPFWD_DEFAULT 0 40 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 41 enum { 42 BR_GROUPFWD_STP = BIT(0), 43 BR_GROUPFWD_MACPAUSE = BIT(1), 44 BR_GROUPFWD_LACP = BIT(2), 45 }; 46 47 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 48 BR_GROUPFWD_LACP) 49 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 50 #define BR_GROUPFWD_8021AD 0xB801u 51 52 /* Path to usermode spanning tree program */ 53 #define BR_STP_PROG "/sbin/bridge-stp" 54 55 typedef struct bridge_id bridge_id; 56 typedef struct mac_addr mac_addr; 57 typedef __u16 port_id; 58 59 struct bridge_id { 60 unsigned char prio[2]; 61 unsigned char addr[ETH_ALEN]; 62 }; 63 64 struct mac_addr { 65 unsigned char addr[ETH_ALEN]; 66 }; 67 68 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 69 /* our own querier */ 70 struct bridge_mcast_own_query { 71 struct timer_list timer; 72 u32 startup_sent; 73 }; 74 75 /* other querier */ 76 struct bridge_mcast_other_query { 77 struct timer_list timer; 78 unsigned long delay_time; 79 }; 80 81 /* selected querier */ 82 struct bridge_mcast_querier { 83 struct br_ip addr; 84 struct net_bridge_port __rcu *port; 85 }; 86 87 /* IGMP/MLD statistics */ 88 struct bridge_mcast_stats { 89 struct br_mcast_stats mstats; 90 struct u64_stats_sync syncp; 91 }; 92 #endif 93 94 struct br_vlan_stats { 95 u64 rx_bytes; 96 u64 rx_packets; 97 u64 tx_bytes; 98 u64 tx_packets; 99 struct u64_stats_sync syncp; 100 }; 101 102 struct br_tunnel_info { 103 __be64 tunnel_id; 104 struct metadata_dst *tunnel_dst; 105 }; 106 107 /* private vlan flags */ 108 enum { 109 BR_VLFLAG_PER_PORT_STATS = BIT(0), 110 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1), 111 }; 112 113 /** 114 * struct net_bridge_vlan - per-vlan entry 115 * 116 * @vnode: rhashtable member 117 * @vid: VLAN id 118 * @flags: bridge vlan flags 119 * @priv_flags: private (in-kernel) bridge vlan flags 120 * @stats: per-cpu VLAN statistics 121 * @br: if MASTER flag set, this points to a bridge struct 122 * @port: if MASTER flag unset, this points to a port struct 123 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 124 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 125 * for this VLAN entry 126 * @vlist: sorted list of VLAN entries 127 * @rcu: used for entry destruction 128 * 129 * This structure is shared between the global per-VLAN entries contained in 130 * the bridge rhashtable and the local per-port per-VLAN entries contained in 131 * the port's rhashtable. The union entries should be interpreted depending on 132 * the entry flags that are set. 133 */ 134 struct net_bridge_vlan { 135 struct rhash_head vnode; 136 struct rhash_head tnode; 137 u16 vid; 138 u16 flags; 139 u16 priv_flags; 140 struct br_vlan_stats __percpu *stats; 141 union { 142 struct net_bridge *br; 143 struct net_bridge_port *port; 144 }; 145 union { 146 refcount_t refcnt; 147 struct net_bridge_vlan *brvlan; 148 }; 149 150 struct br_tunnel_info tinfo; 151 152 struct list_head vlist; 153 154 struct rcu_head rcu; 155 }; 156 157 /** 158 * struct net_bridge_vlan_group 159 * 160 * @vlan_hash: VLAN entry rhashtable 161 * @vlan_list: sorted VLAN entry list 162 * @num_vlans: number of total VLAN entries 163 * @pvid: PVID VLAN id 164 * 165 * IMPORTANT: Be careful when checking if there're VLAN entries using list 166 * primitives because the bridge can have entries in its list which 167 * are just for global context but not for filtering, i.e. they have 168 * the master flag set but not the brentry flag. If you have to check 169 * if there're "real" entries in the bridge please test @num_vlans 170 */ 171 struct net_bridge_vlan_group { 172 struct rhashtable vlan_hash; 173 struct rhashtable tunnel_hash; 174 struct list_head vlan_list; 175 u16 num_vlans; 176 u16 pvid; 177 }; 178 179 struct net_bridge_fdb_key { 180 mac_addr addr; 181 u16 vlan_id; 182 }; 183 184 struct net_bridge_fdb_entry { 185 struct rhash_head rhnode; 186 struct net_bridge_port *dst; 187 188 struct net_bridge_fdb_key key; 189 struct hlist_node fdb_node; 190 unsigned char is_local:1, 191 is_static:1, 192 is_sticky:1, 193 added_by_user:1, 194 added_by_external_learn:1, 195 offloaded:1; 196 197 /* write-heavy members should not affect lookups */ 198 unsigned long updated ____cacheline_aligned_in_smp; 199 unsigned long used; 200 201 struct rcu_head rcu; 202 }; 203 204 #define MDB_PG_FLAGS_PERMANENT BIT(0) 205 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 206 207 struct net_bridge_port_group { 208 struct net_bridge_port *port; 209 struct net_bridge_port_group __rcu *next; 210 struct hlist_node mglist; 211 struct rcu_head rcu; 212 struct timer_list timer; 213 struct br_ip addr; 214 unsigned char flags; 215 unsigned char eth_addr[ETH_ALEN]; 216 }; 217 218 struct net_bridge_mdb_entry { 219 struct rhash_head rhnode; 220 struct net_bridge *br; 221 struct net_bridge_port_group __rcu *ports; 222 struct rcu_head rcu; 223 struct timer_list timer; 224 struct br_ip addr; 225 bool host_joined; 226 struct hlist_node mdb_node; 227 }; 228 229 struct net_bridge_port { 230 struct net_bridge *br; 231 struct net_device *dev; 232 struct list_head list; 233 234 unsigned long flags; 235 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 236 struct net_bridge_vlan_group __rcu *vlgrp; 237 #endif 238 struct net_bridge_port __rcu *backup_port; 239 240 /* STP */ 241 u8 priority; 242 u8 state; 243 u16 port_no; 244 unsigned char topology_change_ack; 245 unsigned char config_pending; 246 port_id port_id; 247 port_id designated_port; 248 bridge_id designated_root; 249 bridge_id designated_bridge; 250 u32 path_cost; 251 u32 designated_cost; 252 unsigned long designated_age; 253 254 struct timer_list forward_delay_timer; 255 struct timer_list hold_timer; 256 struct timer_list message_age_timer; 257 struct kobject kobj; 258 struct rcu_head rcu; 259 260 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 261 struct bridge_mcast_own_query ip4_own_query; 262 #if IS_ENABLED(CONFIG_IPV6) 263 struct bridge_mcast_own_query ip6_own_query; 264 #endif /* IS_ENABLED(CONFIG_IPV6) */ 265 unsigned char multicast_router; 266 struct bridge_mcast_stats __percpu *mcast_stats; 267 struct timer_list multicast_router_timer; 268 struct hlist_head mglist; 269 struct hlist_node rlist; 270 #endif 271 272 #ifdef CONFIG_SYSFS 273 char sysfs_name[IFNAMSIZ]; 274 #endif 275 276 #ifdef CONFIG_NET_POLL_CONTROLLER 277 struct netpoll *np; 278 #endif 279 #ifdef CONFIG_NET_SWITCHDEV 280 int offload_fwd_mark; 281 #endif 282 u16 group_fwd_mask; 283 u16 backup_redirected_cnt; 284 }; 285 286 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 287 288 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 289 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 290 291 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 292 { 293 return rcu_dereference(dev->rx_handler_data); 294 } 295 296 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 297 { 298 return netif_is_bridge_port(dev) ? 299 rtnl_dereference(dev->rx_handler_data) : NULL; 300 } 301 302 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 303 { 304 return netif_is_bridge_port(dev) ? 305 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 306 } 307 308 enum net_bridge_opts { 309 BROPT_VLAN_ENABLED, 310 BROPT_VLAN_STATS_ENABLED, 311 BROPT_NF_CALL_IPTABLES, 312 BROPT_NF_CALL_IP6TABLES, 313 BROPT_NF_CALL_ARPTABLES, 314 BROPT_GROUP_ADDR_SET, 315 BROPT_MULTICAST_ENABLED, 316 BROPT_MULTICAST_QUERIER, 317 BROPT_MULTICAST_QUERY_USE_IFADDR, 318 BROPT_MULTICAST_STATS_ENABLED, 319 BROPT_HAS_IPV6_ADDR, 320 BROPT_NEIGH_SUPPRESS_ENABLED, 321 BROPT_MTU_SET_BY_USER, 322 BROPT_VLAN_STATS_PER_PORT, 323 BROPT_NO_LL_LEARN, 324 }; 325 326 struct net_bridge { 327 spinlock_t lock; 328 spinlock_t hash_lock; 329 struct list_head port_list; 330 struct net_device *dev; 331 struct pcpu_sw_netstats __percpu *stats; 332 unsigned long options; 333 /* These fields are accessed on each packet */ 334 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 335 __be16 vlan_proto; 336 u16 default_pvid; 337 struct net_bridge_vlan_group __rcu *vlgrp; 338 #endif 339 340 struct rhashtable fdb_hash_tbl; 341 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 342 union { 343 struct rtable fake_rtable; 344 struct rt6_info fake_rt6_info; 345 }; 346 #endif 347 u16 group_fwd_mask; 348 u16 group_fwd_mask_required; 349 350 /* STP */ 351 bridge_id designated_root; 352 bridge_id bridge_id; 353 unsigned char topology_change; 354 unsigned char topology_change_detected; 355 u16 root_port; 356 unsigned long max_age; 357 unsigned long hello_time; 358 unsigned long forward_delay; 359 unsigned long ageing_time; 360 unsigned long bridge_max_age; 361 unsigned long bridge_hello_time; 362 unsigned long bridge_forward_delay; 363 unsigned long bridge_ageing_time; 364 u32 root_path_cost; 365 366 u8 group_addr[ETH_ALEN]; 367 368 enum { 369 BR_NO_STP, /* no spanning tree */ 370 BR_KERNEL_STP, /* old STP in kernel */ 371 BR_USER_STP, /* new RSTP in userspace */ 372 } stp_enabled; 373 374 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 375 376 u32 hash_max; 377 378 u32 multicast_last_member_count; 379 u32 multicast_startup_query_count; 380 381 u8 multicast_igmp_version; 382 u8 multicast_router; 383 #if IS_ENABLED(CONFIG_IPV6) 384 u8 multicast_mld_version; 385 #endif 386 spinlock_t multicast_lock; 387 unsigned long multicast_last_member_interval; 388 unsigned long multicast_membership_interval; 389 unsigned long multicast_querier_interval; 390 unsigned long multicast_query_interval; 391 unsigned long multicast_query_response_interval; 392 unsigned long multicast_startup_query_interval; 393 394 struct rhashtable mdb_hash_tbl; 395 396 struct hlist_head mdb_list; 397 struct hlist_head router_list; 398 399 struct timer_list multicast_router_timer; 400 struct bridge_mcast_other_query ip4_other_query; 401 struct bridge_mcast_own_query ip4_own_query; 402 struct bridge_mcast_querier ip4_querier; 403 struct bridge_mcast_stats __percpu *mcast_stats; 404 #if IS_ENABLED(CONFIG_IPV6) 405 struct bridge_mcast_other_query ip6_other_query; 406 struct bridge_mcast_own_query ip6_own_query; 407 struct bridge_mcast_querier ip6_querier; 408 #endif /* IS_ENABLED(CONFIG_IPV6) */ 409 #endif 410 411 struct timer_list hello_timer; 412 struct timer_list tcn_timer; 413 struct timer_list topology_change_timer; 414 struct delayed_work gc_work; 415 struct kobject *ifobj; 416 u32 auto_cnt; 417 418 #ifdef CONFIG_NET_SWITCHDEV 419 int offload_fwd_mark; 420 #endif 421 struct hlist_head fdb_list; 422 }; 423 424 struct br_input_skb_cb { 425 struct net_device *brdev; 426 427 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 428 u8 igmp; 429 u8 mrouters_only:1; 430 #endif 431 u8 proxyarp_replied:1; 432 u8 src_port_isolated:1; 433 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 434 u8 vlan_filtered:1; 435 #endif 436 437 #ifdef CONFIG_NET_SWITCHDEV 438 int offload_fwd_mark; 439 #endif 440 }; 441 442 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 443 444 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 445 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 446 #else 447 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 448 #endif 449 450 #define br_printk(level, br, format, args...) \ 451 printk(level "%s: " format, (br)->dev->name, ##args) 452 453 #define br_err(__br, format, args...) \ 454 br_printk(KERN_ERR, __br, format, ##args) 455 #define br_warn(__br, format, args...) \ 456 br_printk(KERN_WARNING, __br, format, ##args) 457 #define br_notice(__br, format, args...) \ 458 br_printk(KERN_NOTICE, __br, format, ##args) 459 #define br_info(__br, format, args...) \ 460 br_printk(KERN_INFO, __br, format, ##args) 461 462 #define br_debug(br, format, args...) \ 463 pr_debug("%s: " format, (br)->dev->name, ##args) 464 465 /* called under bridge lock */ 466 static inline int br_is_root_bridge(const struct net_bridge *br) 467 { 468 return !memcmp(&br->bridge_id, &br->designated_root, 8); 469 } 470 471 /* check if a VLAN entry is global */ 472 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 473 { 474 return v->flags & BRIDGE_VLAN_INFO_MASTER; 475 } 476 477 /* check if a VLAN entry is used by the bridge */ 478 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 479 { 480 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 481 } 482 483 /* check if we should use the vlan entry, returns false if it's only context */ 484 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 485 { 486 if (br_vlan_is_master(v)) { 487 if (br_vlan_is_brentry(v)) 488 return true; 489 else 490 return false; 491 } 492 493 return true; 494 } 495 496 static inline int br_opt_get(const struct net_bridge *br, 497 enum net_bridge_opts opt) 498 { 499 return test_bit(opt, &br->options); 500 } 501 502 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 503 struct netlink_ext_ack *extack); 504 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 505 int br_boolopt_multi_toggle(struct net_bridge *br, 506 struct br_boolopt_multi *bm, 507 struct netlink_ext_ack *extack); 508 void br_boolopt_multi_get(const struct net_bridge *br, 509 struct br_boolopt_multi *bm); 510 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 511 512 /* br_device.c */ 513 void br_dev_setup(struct net_device *dev); 514 void br_dev_delete(struct net_device *dev, struct list_head *list); 515 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 516 #ifdef CONFIG_NET_POLL_CONTROLLER 517 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 518 struct sk_buff *skb) 519 { 520 struct netpoll *np = p->np; 521 522 if (np) 523 netpoll_send_skb(np, skb); 524 } 525 526 int br_netpoll_enable(struct net_bridge_port *p); 527 void br_netpoll_disable(struct net_bridge_port *p); 528 #else 529 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 530 struct sk_buff *skb) 531 { 532 } 533 534 static inline int br_netpoll_enable(struct net_bridge_port *p) 535 { 536 return 0; 537 } 538 539 static inline void br_netpoll_disable(struct net_bridge_port *p) 540 { 541 } 542 #endif 543 544 /* br_fdb.c */ 545 int br_fdb_init(void); 546 void br_fdb_fini(void); 547 int br_fdb_hash_init(struct net_bridge *br); 548 void br_fdb_hash_fini(struct net_bridge *br); 549 void br_fdb_flush(struct net_bridge *br); 550 void br_fdb_find_delete_local(struct net_bridge *br, 551 const struct net_bridge_port *p, 552 const unsigned char *addr, u16 vid); 553 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 554 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 555 void br_fdb_cleanup(struct work_struct *work); 556 void br_fdb_delete_by_port(struct net_bridge *br, 557 const struct net_bridge_port *p, u16 vid, int do_all); 558 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 559 const unsigned char *addr, 560 __u16 vid); 561 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 562 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 563 unsigned long off); 564 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 565 const unsigned char *addr, u16 vid); 566 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 567 const unsigned char *addr, u16 vid, bool added_by_user); 568 569 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 570 struct net_device *dev, const unsigned char *addr, u16 vid); 571 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 572 const unsigned char *addr, u16 vid, u16 nlh_flags, 573 struct netlink_ext_ack *extack); 574 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 575 struct net_device *dev, struct net_device *fdev, int *idx); 576 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev, 577 const unsigned char *addr, u16 vid, u32 portid, u32 seq, 578 struct netlink_ext_ack *extack); 579 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 580 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 581 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 582 const unsigned char *addr, u16 vid, 583 bool swdev_notify); 584 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 585 const unsigned char *addr, u16 vid, 586 bool swdev_notify); 587 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 588 const unsigned char *addr, u16 vid, bool offloaded); 589 590 /* br_forward.c */ 591 enum br_pkt_type { 592 BR_PKT_UNICAST, 593 BR_PKT_MULTICAST, 594 BR_PKT_BROADCAST 595 }; 596 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 597 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 598 bool local_rcv, bool local_orig); 599 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 600 void br_flood(struct net_bridge *br, struct sk_buff *skb, 601 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 602 603 /* return true if both source port and dest port are isolated */ 604 static inline bool br_skb_isolated(const struct net_bridge_port *to, 605 const struct sk_buff *skb) 606 { 607 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 608 (to->flags & BR_ISOLATED); 609 } 610 611 /* br_if.c */ 612 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 613 int br_add_bridge(struct net *net, const char *name); 614 int br_del_bridge(struct net *net, const char *name); 615 int br_add_if(struct net_bridge *br, struct net_device *dev, 616 struct netlink_ext_ack *extack); 617 int br_del_if(struct net_bridge *br, struct net_device *dev); 618 void br_mtu_auto_adjust(struct net_bridge *br); 619 netdev_features_t br_features_recompute(struct net_bridge *br, 620 netdev_features_t features); 621 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 622 void br_manage_promisc(struct net_bridge *br); 623 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 624 625 /* br_input.c */ 626 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 627 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 628 629 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 630 { 631 return rcu_dereference(dev->rx_handler) == br_handle_frame; 632 } 633 634 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 635 { 636 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 637 } 638 639 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 640 { 641 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 642 } 643 644 static inline struct net_bridge_port * 645 br_port_get_check_rtnl(const struct net_device *dev) 646 { 647 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 648 } 649 650 /* br_ioctl.c */ 651 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 652 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 653 void __user *arg); 654 655 /* br_multicast.c */ 656 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 657 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 658 struct sk_buff *skb, u16 vid); 659 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 660 struct sk_buff *skb, u16 vid); 661 int br_multicast_add_port(struct net_bridge_port *port); 662 void br_multicast_del_port(struct net_bridge_port *port); 663 void br_multicast_enable_port(struct net_bridge_port *port); 664 void br_multicast_disable_port(struct net_bridge_port *port); 665 void br_multicast_init(struct net_bridge *br); 666 void br_multicast_open(struct net_bridge *br); 667 void br_multicast_stop(struct net_bridge *br); 668 void br_multicast_dev_del(struct net_bridge *br); 669 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 670 struct sk_buff *skb, bool local_rcv, bool local_orig); 671 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 672 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 673 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 674 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 675 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 676 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 677 #if IS_ENABLED(CONFIG_IPV6) 678 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 679 #endif 680 struct net_bridge_mdb_entry * 681 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst); 682 struct net_bridge_mdb_entry * 683 br_multicast_new_group(struct net_bridge *br, struct br_ip *group); 684 struct net_bridge_port_group * 685 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 686 struct net_bridge_port_group __rcu *next, 687 unsigned char flags, const unsigned char *src); 688 int br_mdb_hash_init(struct net_bridge *br); 689 void br_mdb_hash_fini(struct net_bridge *br); 690 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 691 struct br_ip *group, int type, u8 flags); 692 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 693 int type); 694 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 695 const struct sk_buff *skb, u8 type, u8 dir); 696 int br_multicast_init_stats(struct net_bridge *br); 697 void br_multicast_uninit_stats(struct net_bridge *br); 698 void br_multicast_get_stats(const struct net_bridge *br, 699 const struct net_bridge_port *p, 700 struct br_mcast_stats *dest); 701 void br_mdb_init(void); 702 void br_mdb_uninit(void); 703 704 #define mlock_dereference(X, br) \ 705 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 706 707 static inline bool br_multicast_is_router(struct net_bridge *br) 708 { 709 return br->multicast_router == 2 || 710 (br->multicast_router == 1 && 711 timer_pending(&br->multicast_router_timer)); 712 } 713 714 static inline bool 715 __br_multicast_querier_exists(struct net_bridge *br, 716 struct bridge_mcast_other_query *querier, 717 const bool is_ipv6) 718 { 719 bool own_querier_enabled; 720 721 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 722 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 723 own_querier_enabled = false; 724 else 725 own_querier_enabled = true; 726 } else { 727 own_querier_enabled = false; 728 } 729 730 return time_is_before_jiffies(querier->delay_time) && 731 (own_querier_enabled || timer_pending(&querier->timer)); 732 } 733 734 static inline bool br_multicast_querier_exists(struct net_bridge *br, 735 struct ethhdr *eth) 736 { 737 switch (eth->h_proto) { 738 case (htons(ETH_P_IP)): 739 return __br_multicast_querier_exists(br, 740 &br->ip4_other_query, false); 741 #if IS_ENABLED(CONFIG_IPV6) 742 case (htons(ETH_P_IPV6)): 743 return __br_multicast_querier_exists(br, 744 &br->ip6_other_query, true); 745 #endif 746 default: 747 return false; 748 } 749 } 750 751 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 752 { 753 return BR_INPUT_SKB_CB(skb)->igmp; 754 } 755 #else 756 static inline int br_multicast_rcv(struct net_bridge *br, 757 struct net_bridge_port *port, 758 struct sk_buff *skb, 759 u16 vid) 760 { 761 return 0; 762 } 763 764 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 765 struct sk_buff *skb, u16 vid) 766 { 767 return NULL; 768 } 769 770 static inline int br_multicast_add_port(struct net_bridge_port *port) 771 { 772 return 0; 773 } 774 775 static inline void br_multicast_del_port(struct net_bridge_port *port) 776 { 777 } 778 779 static inline void br_multicast_enable_port(struct net_bridge_port *port) 780 { 781 } 782 783 static inline void br_multicast_disable_port(struct net_bridge_port *port) 784 { 785 } 786 787 static inline void br_multicast_init(struct net_bridge *br) 788 { 789 } 790 791 static inline void br_multicast_open(struct net_bridge *br) 792 { 793 } 794 795 static inline void br_multicast_stop(struct net_bridge *br) 796 { 797 } 798 799 static inline void br_multicast_dev_del(struct net_bridge *br) 800 { 801 } 802 803 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 804 struct sk_buff *skb, 805 bool local_rcv, bool local_orig) 806 { 807 } 808 809 static inline bool br_multicast_is_router(struct net_bridge *br) 810 { 811 return false; 812 } 813 814 static inline bool br_multicast_querier_exists(struct net_bridge *br, 815 struct ethhdr *eth) 816 { 817 return false; 818 } 819 820 static inline void br_mdb_init(void) 821 { 822 } 823 824 static inline void br_mdb_uninit(void) 825 { 826 } 827 828 static inline int br_mdb_hash_init(struct net_bridge *br) 829 { 830 return 0; 831 } 832 833 static inline void br_mdb_hash_fini(struct net_bridge *br) 834 { 835 } 836 837 static inline void br_multicast_count(struct net_bridge *br, 838 const struct net_bridge_port *p, 839 const struct sk_buff *skb, 840 u8 type, u8 dir) 841 { 842 } 843 844 static inline int br_multicast_init_stats(struct net_bridge *br) 845 { 846 return 0; 847 } 848 849 static inline void br_multicast_uninit_stats(struct net_bridge *br) 850 { 851 } 852 853 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 854 { 855 return 0; 856 } 857 #endif 858 859 /* br_vlan.c */ 860 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 861 bool br_allowed_ingress(const struct net_bridge *br, 862 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 863 u16 *vid); 864 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 865 const struct sk_buff *skb); 866 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 867 struct sk_buff *br_handle_vlan(struct net_bridge *br, 868 const struct net_bridge_port *port, 869 struct net_bridge_vlan_group *vg, 870 struct sk_buff *skb); 871 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 872 bool *changed, struct netlink_ext_ack *extack); 873 int br_vlan_delete(struct net_bridge *br, u16 vid); 874 void br_vlan_flush(struct net_bridge *br); 875 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 876 void br_recalculate_fwd_mask(struct net_bridge *br); 877 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 878 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 879 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 880 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 881 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 882 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 883 int br_vlan_init(struct net_bridge *br); 884 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 885 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 886 struct netlink_ext_ack *extack); 887 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 888 bool *changed, struct netlink_ext_ack *extack); 889 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 890 void nbp_vlan_flush(struct net_bridge_port *port); 891 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack); 892 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 893 void br_vlan_get_stats(const struct net_bridge_vlan *v, 894 struct br_vlan_stats *stats); 895 896 static inline struct net_bridge_vlan_group *br_vlan_group( 897 const struct net_bridge *br) 898 { 899 return rtnl_dereference(br->vlgrp); 900 } 901 902 static inline struct net_bridge_vlan_group *nbp_vlan_group( 903 const struct net_bridge_port *p) 904 { 905 return rtnl_dereference(p->vlgrp); 906 } 907 908 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 909 const struct net_bridge *br) 910 { 911 return rcu_dereference(br->vlgrp); 912 } 913 914 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 915 const struct net_bridge_port *p) 916 { 917 return rcu_dereference(p->vlgrp); 918 } 919 920 /* Since bridge now depends on 8021Q module, but the time bridge sees the 921 * skb, the vlan tag will always be present if the frame was tagged. 922 */ 923 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 924 { 925 int err = 0; 926 927 if (skb_vlan_tag_present(skb)) { 928 *vid = skb_vlan_tag_get_id(skb); 929 } else { 930 *vid = 0; 931 err = -EINVAL; 932 } 933 934 return err; 935 } 936 937 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 938 { 939 if (!vg) 940 return 0; 941 942 smp_rmb(); 943 return vg->pvid; 944 } 945 946 #else 947 static inline bool br_allowed_ingress(const struct net_bridge *br, 948 struct net_bridge_vlan_group *vg, 949 struct sk_buff *skb, 950 u16 *vid) 951 { 952 return true; 953 } 954 955 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 956 const struct sk_buff *skb) 957 { 958 return true; 959 } 960 961 static inline bool br_should_learn(struct net_bridge_port *p, 962 struct sk_buff *skb, u16 *vid) 963 { 964 return true; 965 } 966 967 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 968 const struct net_bridge_port *port, 969 struct net_bridge_vlan_group *vg, 970 struct sk_buff *skb) 971 { 972 return skb; 973 } 974 975 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 976 bool *changed, struct netlink_ext_ack *extack) 977 { 978 *changed = false; 979 return -EOPNOTSUPP; 980 } 981 982 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 983 { 984 return -EOPNOTSUPP; 985 } 986 987 static inline void br_vlan_flush(struct net_bridge *br) 988 { 989 } 990 991 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 992 { 993 } 994 995 static inline int br_vlan_init(struct net_bridge *br) 996 { 997 return 0; 998 } 999 1000 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1001 bool *changed, struct netlink_ext_ack *extack) 1002 { 1003 *changed = false; 1004 return -EOPNOTSUPP; 1005 } 1006 1007 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1008 { 1009 return -EOPNOTSUPP; 1010 } 1011 1012 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1013 { 1014 } 1015 1016 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1017 u16 vid) 1018 { 1019 return NULL; 1020 } 1021 1022 static inline int nbp_vlan_init(struct net_bridge_port *port, 1023 struct netlink_ext_ack *extack) 1024 { 1025 return 0; 1026 } 1027 1028 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1029 { 1030 return 0; 1031 } 1032 1033 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1034 { 1035 return 0; 1036 } 1037 1038 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1039 unsigned long val) 1040 { 1041 return -EOPNOTSUPP; 1042 } 1043 1044 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1045 u32 filter_mask) 1046 { 1047 return 0; 1048 } 1049 1050 static inline struct net_bridge_vlan_group *br_vlan_group( 1051 const struct net_bridge *br) 1052 { 1053 return NULL; 1054 } 1055 1056 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1057 const struct net_bridge_port *p) 1058 { 1059 return NULL; 1060 } 1061 1062 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1063 const struct net_bridge *br) 1064 { 1065 return NULL; 1066 } 1067 1068 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1069 const struct net_bridge_port *p) 1070 { 1071 return NULL; 1072 } 1073 1074 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1075 struct br_vlan_stats *stats) 1076 { 1077 } 1078 #endif 1079 1080 struct nf_br_ops { 1081 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1082 }; 1083 extern const struct nf_br_ops __rcu *nf_br_ops; 1084 1085 /* br_netfilter.c */ 1086 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1087 int br_nf_core_init(void); 1088 void br_nf_core_fini(void); 1089 void br_netfilter_rtable_init(struct net_bridge *); 1090 #else 1091 static inline int br_nf_core_init(void) { return 0; } 1092 static inline void br_nf_core_fini(void) {} 1093 #define br_netfilter_rtable_init(x) 1094 #endif 1095 1096 /* br_stp.c */ 1097 void br_set_state(struct net_bridge_port *p, unsigned int state); 1098 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1099 void br_init_port(struct net_bridge_port *p); 1100 void br_become_designated_port(struct net_bridge_port *p); 1101 1102 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1103 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1104 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1105 int br_set_max_age(struct net_bridge *br, unsigned long x); 1106 int __set_ageing_time(struct net_device *dev, unsigned long t); 1107 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1108 1109 1110 /* br_stp_if.c */ 1111 void br_stp_enable_bridge(struct net_bridge *br); 1112 void br_stp_disable_bridge(struct net_bridge *br); 1113 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1114 void br_stp_enable_port(struct net_bridge_port *p); 1115 void br_stp_disable_port(struct net_bridge_port *p); 1116 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1117 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1118 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1119 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1120 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1121 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1122 1123 /* br_stp_bpdu.c */ 1124 struct stp_proto; 1125 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1126 struct net_device *dev); 1127 1128 /* br_stp_timer.c */ 1129 void br_stp_timer_init(struct net_bridge *br); 1130 void br_stp_port_timer_init(struct net_bridge_port *p); 1131 unsigned long br_timer_value(const struct timer_list *timer); 1132 1133 /* br.c */ 1134 #if IS_ENABLED(CONFIG_ATM_LANE) 1135 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1136 #endif 1137 1138 /* br_netlink.c */ 1139 extern struct rtnl_link_ops br_link_ops; 1140 int br_netlink_init(void); 1141 void br_netlink_fini(void); 1142 void br_ifinfo_notify(int event, const struct net_bridge *br, 1143 const struct net_bridge_port *port); 1144 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags, 1145 struct netlink_ext_ack *extack); 1146 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1147 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1148 u32 filter_mask, int nlflags); 1149 1150 #ifdef CONFIG_SYSFS 1151 /* br_sysfs_if.c */ 1152 extern const struct sysfs_ops brport_sysfs_ops; 1153 int br_sysfs_addif(struct net_bridge_port *p); 1154 int br_sysfs_renameif(struct net_bridge_port *p); 1155 1156 /* br_sysfs_br.c */ 1157 int br_sysfs_addbr(struct net_device *dev); 1158 void br_sysfs_delbr(struct net_device *dev); 1159 1160 #else 1161 1162 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1163 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1164 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1165 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1166 #endif /* CONFIG_SYSFS */ 1167 1168 /* br_switchdev.c */ 1169 #ifdef CONFIG_NET_SWITCHDEV 1170 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1171 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1172 struct sk_buff *skb); 1173 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1174 const struct sk_buff *skb); 1175 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1176 unsigned long flags, 1177 unsigned long mask); 1178 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1179 int type); 1180 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, 1181 struct netlink_ext_ack *extack); 1182 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1183 1184 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1185 { 1186 skb->offload_fwd_mark = 0; 1187 } 1188 #else 1189 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1190 { 1191 return 0; 1192 } 1193 1194 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1195 struct sk_buff *skb) 1196 { 1197 } 1198 1199 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1200 const struct sk_buff *skb) 1201 { 1202 return true; 1203 } 1204 1205 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1206 unsigned long flags, 1207 unsigned long mask) 1208 { 1209 return 0; 1210 } 1211 1212 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1213 u16 vid, u16 flags, 1214 struct netlink_ext_ack *extack) 1215 { 1216 return -EOPNOTSUPP; 1217 } 1218 1219 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1220 { 1221 return -EOPNOTSUPP; 1222 } 1223 1224 static inline void 1225 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1226 { 1227 } 1228 1229 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1230 { 1231 } 1232 #endif /* CONFIG_NET_SWITCHDEV */ 1233 1234 /* br_arp_nd_proxy.c */ 1235 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1236 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1237 u16 vid, struct net_bridge_port *p); 1238 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1239 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1240 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1241 #endif 1242