1 /* 2 * Linux ethernet bridge 3 * 4 * Authors: 5 * Lennert Buytenhek <buytenh@gnu.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _BR_PRIVATE_H 14 #define _BR_PRIVATE_H 15 16 #include <linux/netdevice.h> 17 #include <linux/if_bridge.h> 18 #include <linux/netpoll.h> 19 #include <linux/u64_stats_sync.h> 20 #include <net/route.h> 21 #include <net/ip6_fib.h> 22 #include <linux/if_vlan.h> 23 #include <linux/rhashtable.h> 24 #include <linux/refcount.h> 25 26 #define BR_HASH_BITS 8 27 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 28 29 #define BR_HOLD_TIME (1*HZ) 30 31 #define BR_PORT_BITS 10 32 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 33 34 #define BR_VERSION "2.3" 35 36 /* Control of forwarding link local multicast */ 37 #define BR_GROUPFWD_DEFAULT 0 38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 39 enum { 40 BR_GROUPFWD_STP = BIT(0), 41 BR_GROUPFWD_MACPAUSE = BIT(1), 42 BR_GROUPFWD_LACP = BIT(2), 43 }; 44 45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 46 BR_GROUPFWD_LACP) 47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 48 #define BR_GROUPFWD_8021AD 0xB801u 49 50 /* Path to usermode spanning tree program */ 51 #define BR_STP_PROG "/sbin/bridge-stp" 52 53 typedef struct bridge_id bridge_id; 54 typedef struct mac_addr mac_addr; 55 typedef __u16 port_id; 56 57 struct bridge_id 58 { 59 unsigned char prio[2]; 60 unsigned char addr[ETH_ALEN]; 61 }; 62 63 struct mac_addr 64 { 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 /** 108 * struct net_bridge_vlan - per-vlan entry 109 * 110 * @vnode: rhashtable member 111 * @vid: VLAN id 112 * @flags: bridge vlan flags 113 * @stats: per-cpu VLAN statistics 114 * @br: if MASTER flag set, this points to a bridge struct 115 * @port: if MASTER flag unset, this points to a port struct 116 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 117 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 118 * for this VLAN entry 119 * @vlist: sorted list of VLAN entries 120 * @rcu: used for entry destruction 121 * 122 * This structure is shared between the global per-VLAN entries contained in 123 * the bridge rhashtable and the local per-port per-VLAN entries contained in 124 * the port's rhashtable. The union entries should be interpreted depending on 125 * the entry flags that are set. 126 */ 127 struct net_bridge_vlan { 128 struct rhash_head vnode; 129 struct rhash_head tnode; 130 u16 vid; 131 u16 flags; 132 struct br_vlan_stats __percpu *stats; 133 union { 134 struct net_bridge *br; 135 struct net_bridge_port *port; 136 }; 137 union { 138 refcount_t refcnt; 139 struct net_bridge_vlan *brvlan; 140 }; 141 142 struct br_tunnel_info tinfo; 143 144 struct list_head vlist; 145 146 struct rcu_head rcu; 147 }; 148 149 /** 150 * struct net_bridge_vlan_group 151 * 152 * @vlan_hash: VLAN entry rhashtable 153 * @vlan_list: sorted VLAN entry list 154 * @num_vlans: number of total VLAN entries 155 * @pvid: PVID VLAN id 156 * 157 * IMPORTANT: Be careful when checking if there're VLAN entries using list 158 * primitives because the bridge can have entries in its list which 159 * are just for global context but not for filtering, i.e. they have 160 * the master flag set but not the brentry flag. If you have to check 161 * if there're "real" entries in the bridge please test @num_vlans 162 */ 163 struct net_bridge_vlan_group { 164 struct rhashtable vlan_hash; 165 struct rhashtable tunnel_hash; 166 struct list_head vlan_list; 167 u16 num_vlans; 168 u16 pvid; 169 }; 170 171 struct net_bridge_fdb_key { 172 mac_addr addr; 173 u16 vlan_id; 174 }; 175 176 struct net_bridge_fdb_entry { 177 struct rhash_head rhnode; 178 struct net_bridge_port *dst; 179 180 struct net_bridge_fdb_key key; 181 struct hlist_node fdb_node; 182 unsigned char is_local:1, 183 is_static:1, 184 added_by_user:1, 185 added_by_external_learn:1, 186 offloaded:1; 187 188 /* write-heavy members should not affect lookups */ 189 unsigned long updated ____cacheline_aligned_in_smp; 190 unsigned long used; 191 192 struct rcu_head rcu; 193 }; 194 195 #define MDB_PG_FLAGS_PERMANENT BIT(0) 196 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 197 198 struct net_bridge_port_group { 199 struct net_bridge_port *port; 200 struct net_bridge_port_group __rcu *next; 201 struct hlist_node mglist; 202 struct rcu_head rcu; 203 struct timer_list timer; 204 struct br_ip addr; 205 unsigned char flags; 206 unsigned char eth_addr[ETH_ALEN]; 207 }; 208 209 struct net_bridge_mdb_entry 210 { 211 struct hlist_node hlist[2]; 212 struct net_bridge *br; 213 struct net_bridge_port_group __rcu *ports; 214 struct rcu_head rcu; 215 struct timer_list timer; 216 struct br_ip addr; 217 bool host_joined; 218 }; 219 220 struct net_bridge_mdb_htable 221 { 222 struct hlist_head *mhash; 223 struct rcu_head rcu; 224 struct net_bridge_mdb_htable *old; 225 u32 size; 226 u32 max; 227 u32 secret; 228 u32 ver; 229 }; 230 231 struct net_bridge_port { 232 struct net_bridge *br; 233 struct net_device *dev; 234 struct list_head list; 235 236 unsigned long flags; 237 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 238 struct net_bridge_vlan_group __rcu *vlgrp; 239 #endif 240 241 /* STP */ 242 u8 priority; 243 u8 state; 244 u16 port_no; 245 unsigned char topology_change_ack; 246 unsigned char config_pending; 247 port_id port_id; 248 port_id designated_port; 249 bridge_id designated_root; 250 bridge_id designated_bridge; 251 u32 path_cost; 252 u32 designated_cost; 253 unsigned long designated_age; 254 255 struct timer_list forward_delay_timer; 256 struct timer_list hold_timer; 257 struct timer_list message_age_timer; 258 struct kobject kobj; 259 struct rcu_head rcu; 260 261 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 262 struct bridge_mcast_own_query ip4_own_query; 263 #if IS_ENABLED(CONFIG_IPV6) 264 struct bridge_mcast_own_query ip6_own_query; 265 #endif /* IS_ENABLED(CONFIG_IPV6) */ 266 unsigned char multicast_router; 267 struct bridge_mcast_stats __percpu *mcast_stats; 268 struct timer_list multicast_router_timer; 269 struct hlist_head mglist; 270 struct hlist_node rlist; 271 #endif 272 273 #ifdef CONFIG_SYSFS 274 char sysfs_name[IFNAMSIZ]; 275 #endif 276 277 #ifdef CONFIG_NET_POLL_CONTROLLER 278 struct netpoll *np; 279 #endif 280 #ifdef CONFIG_NET_SWITCHDEV 281 int offload_fwd_mark; 282 #endif 283 u16 group_fwd_mask; 284 }; 285 286 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 287 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 288 289 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 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 br_port_exists(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 br_port_exists(dev) ? 305 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 306 } 307 308 struct net_bridge { 309 spinlock_t lock; 310 spinlock_t hash_lock; 311 struct list_head port_list; 312 struct net_device *dev; 313 struct pcpu_sw_netstats __percpu *stats; 314 /* These fields are accessed on each packet */ 315 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 316 u8 vlan_enabled; 317 u8 vlan_stats_enabled; 318 __be16 vlan_proto; 319 u16 default_pvid; 320 struct net_bridge_vlan_group __rcu *vlgrp; 321 #endif 322 323 struct rhashtable fdb_hash_tbl; 324 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 325 union { 326 struct rtable fake_rtable; 327 struct rt6_info fake_rt6_info; 328 }; 329 bool nf_call_iptables; 330 bool nf_call_ip6tables; 331 bool nf_call_arptables; 332 #endif 333 u16 group_fwd_mask; 334 u16 group_fwd_mask_required; 335 336 /* STP */ 337 bridge_id designated_root; 338 bridge_id bridge_id; 339 u32 root_path_cost; 340 unsigned char topology_change; 341 unsigned char topology_change_detected; 342 u16 root_port; 343 unsigned long max_age; 344 unsigned long hello_time; 345 unsigned long forward_delay; 346 unsigned long ageing_time; 347 unsigned long bridge_max_age; 348 unsigned long bridge_hello_time; 349 unsigned long bridge_forward_delay; 350 unsigned long bridge_ageing_time; 351 352 u8 group_addr[ETH_ALEN]; 353 bool group_addr_set; 354 355 enum { 356 BR_NO_STP, /* no spanning tree */ 357 BR_KERNEL_STP, /* old STP in kernel */ 358 BR_USER_STP, /* new RSTP in userspace */ 359 } stp_enabled; 360 361 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 362 unsigned char multicast_router; 363 364 u8 multicast_disabled:1; 365 u8 multicast_querier:1; 366 u8 multicast_query_use_ifaddr:1; 367 u8 has_ipv6_addr:1; 368 u8 multicast_stats_enabled:1; 369 370 u32 hash_elasticity; 371 u32 hash_max; 372 373 u32 multicast_last_member_count; 374 u32 multicast_startup_query_count; 375 376 u8 multicast_igmp_version; 377 378 unsigned long multicast_last_member_interval; 379 unsigned long multicast_membership_interval; 380 unsigned long multicast_querier_interval; 381 unsigned long multicast_query_interval; 382 unsigned long multicast_query_response_interval; 383 unsigned long multicast_startup_query_interval; 384 385 spinlock_t multicast_lock; 386 struct net_bridge_mdb_htable __rcu *mdb; 387 struct hlist_head router_list; 388 389 struct timer_list multicast_router_timer; 390 struct bridge_mcast_other_query ip4_other_query; 391 struct bridge_mcast_own_query ip4_own_query; 392 struct bridge_mcast_querier ip4_querier; 393 struct bridge_mcast_stats __percpu *mcast_stats; 394 #if IS_ENABLED(CONFIG_IPV6) 395 struct bridge_mcast_other_query ip6_other_query; 396 struct bridge_mcast_own_query ip6_own_query; 397 struct bridge_mcast_querier ip6_querier; 398 u8 multicast_mld_version; 399 #endif /* IS_ENABLED(CONFIG_IPV6) */ 400 #endif 401 402 struct timer_list hello_timer; 403 struct timer_list tcn_timer; 404 struct timer_list topology_change_timer; 405 struct delayed_work gc_work; 406 struct kobject *ifobj; 407 u32 auto_cnt; 408 409 #ifdef CONFIG_NET_SWITCHDEV 410 int offload_fwd_mark; 411 #endif 412 bool neigh_suppress_enabled; 413 bool mtu_set_by_user; 414 struct hlist_head fdb_list; 415 }; 416 417 struct br_input_skb_cb { 418 struct net_device *brdev; 419 420 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 421 int igmp; 422 int mrouters_only; 423 #endif 424 425 bool proxyarp_replied; 426 bool src_port_isolated; 427 428 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 429 bool vlan_filtered; 430 #endif 431 432 #ifdef CONFIG_NET_SWITCHDEV 433 int offload_fwd_mark; 434 #endif 435 }; 436 437 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 438 439 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 440 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 441 #else 442 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 443 #endif 444 445 #define br_printk(level, br, format, args...) \ 446 printk(level "%s: " format, (br)->dev->name, ##args) 447 448 #define br_err(__br, format, args...) \ 449 br_printk(KERN_ERR, __br, format, ##args) 450 #define br_warn(__br, format, args...) \ 451 br_printk(KERN_WARNING, __br, format, ##args) 452 #define br_notice(__br, format, args...) \ 453 br_printk(KERN_NOTICE, __br, format, ##args) 454 #define br_info(__br, format, args...) \ 455 br_printk(KERN_INFO, __br, format, ##args) 456 457 #define br_debug(br, format, args...) \ 458 pr_debug("%s: " format, (br)->dev->name, ##args) 459 460 /* called under bridge lock */ 461 static inline int br_is_root_bridge(const struct net_bridge *br) 462 { 463 return !memcmp(&br->bridge_id, &br->designated_root, 8); 464 } 465 466 /* check if a VLAN entry is global */ 467 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 468 { 469 return v->flags & BRIDGE_VLAN_INFO_MASTER; 470 } 471 472 /* check if a VLAN entry is used by the bridge */ 473 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 474 { 475 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 476 } 477 478 /* check if we should use the vlan entry, returns false if it's only context */ 479 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 480 { 481 if (br_vlan_is_master(v)) { 482 if (br_vlan_is_brentry(v)) 483 return true; 484 else 485 return false; 486 } 487 488 return true; 489 } 490 491 /* br_device.c */ 492 void br_dev_setup(struct net_device *dev); 493 void br_dev_delete(struct net_device *dev, struct list_head *list); 494 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 495 #ifdef CONFIG_NET_POLL_CONTROLLER 496 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 497 struct sk_buff *skb) 498 { 499 struct netpoll *np = p->np; 500 501 if (np) 502 netpoll_send_skb(np, skb); 503 } 504 505 int br_netpoll_enable(struct net_bridge_port *p); 506 void br_netpoll_disable(struct net_bridge_port *p); 507 #else 508 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 509 struct sk_buff *skb) 510 { 511 } 512 513 static inline int br_netpoll_enable(struct net_bridge_port *p) 514 { 515 return 0; 516 } 517 518 static inline void br_netpoll_disable(struct net_bridge_port *p) 519 { 520 } 521 #endif 522 523 /* br_fdb.c */ 524 int br_fdb_init(void); 525 void br_fdb_fini(void); 526 int br_fdb_hash_init(struct net_bridge *br); 527 void br_fdb_hash_fini(struct net_bridge *br); 528 void br_fdb_flush(struct net_bridge *br); 529 void br_fdb_find_delete_local(struct net_bridge *br, 530 const struct net_bridge_port *p, 531 const unsigned char *addr, u16 vid); 532 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 533 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 534 void br_fdb_cleanup(struct work_struct *work); 535 void br_fdb_delete_by_port(struct net_bridge *br, 536 const struct net_bridge_port *p, u16 vid, int do_all); 537 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 538 const unsigned char *addr, 539 __u16 vid); 540 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 541 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 542 unsigned long off); 543 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 544 const unsigned char *addr, u16 vid); 545 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 546 const unsigned char *addr, u16 vid, bool added_by_user); 547 548 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 549 struct net_device *dev, const unsigned char *addr, u16 vid); 550 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 551 const unsigned char *addr, u16 vid, u16 nlh_flags); 552 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 553 struct net_device *dev, struct net_device *fdev, int *idx); 554 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 555 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 556 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 557 const unsigned char *addr, u16 vid, 558 bool swdev_notify); 559 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 560 const unsigned char *addr, u16 vid, 561 bool swdev_notify); 562 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 563 const unsigned char *addr, u16 vid); 564 565 /* br_forward.c */ 566 enum br_pkt_type { 567 BR_PKT_UNICAST, 568 BR_PKT_MULTICAST, 569 BR_PKT_BROADCAST 570 }; 571 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 572 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 573 bool local_rcv, bool local_orig); 574 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 575 void br_flood(struct net_bridge *br, struct sk_buff *skb, 576 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 577 578 /* return true if both source port and dest port are isolated */ 579 static inline bool br_skb_isolated(const struct net_bridge_port *to, 580 const struct sk_buff *skb) 581 { 582 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 583 (to->flags & BR_ISOLATED); 584 } 585 586 /* br_if.c */ 587 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 588 int br_add_bridge(struct net *net, const char *name); 589 int br_del_bridge(struct net *net, const char *name); 590 int br_add_if(struct net_bridge *br, struct net_device *dev, 591 struct netlink_ext_ack *extack); 592 int br_del_if(struct net_bridge *br, struct net_device *dev); 593 void br_mtu_auto_adjust(struct net_bridge *br); 594 netdev_features_t br_features_recompute(struct net_bridge *br, 595 netdev_features_t features); 596 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 597 void br_manage_promisc(struct net_bridge *br); 598 599 /* br_input.c */ 600 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 601 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 602 603 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 604 { 605 return rcu_dereference(dev->rx_handler) == br_handle_frame; 606 } 607 608 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 609 { 610 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 611 } 612 613 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 614 { 615 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 616 } 617 618 static inline struct net_bridge_port * 619 br_port_get_check_rtnl(const struct net_device *dev) 620 { 621 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 622 } 623 624 /* br_ioctl.c */ 625 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 626 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 627 void __user *arg); 628 629 /* br_multicast.c */ 630 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 631 extern unsigned int br_mdb_rehash_seq; 632 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 633 struct sk_buff *skb, u16 vid); 634 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 635 struct sk_buff *skb, u16 vid); 636 int br_multicast_add_port(struct net_bridge_port *port); 637 void br_multicast_del_port(struct net_bridge_port *port); 638 void br_multicast_enable_port(struct net_bridge_port *port); 639 void br_multicast_disable_port(struct net_bridge_port *port); 640 void br_multicast_init(struct net_bridge *br); 641 void br_multicast_open(struct net_bridge *br); 642 void br_multicast_stop(struct net_bridge *br); 643 void br_multicast_dev_del(struct net_bridge *br); 644 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 645 struct sk_buff *skb, bool local_rcv, bool local_orig); 646 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 647 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 648 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 649 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 650 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 651 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 652 #if IS_ENABLED(CONFIG_IPV6) 653 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 654 #endif 655 struct net_bridge_mdb_entry * 656 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 657 struct net_bridge_mdb_entry * 658 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 659 struct br_ip *group); 660 void br_multicast_free_pg(struct rcu_head *head); 661 struct net_bridge_port_group * 662 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 663 struct net_bridge_port_group __rcu *next, 664 unsigned char flags, const unsigned char *src); 665 void br_mdb_init(void); 666 void br_mdb_uninit(void); 667 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 668 struct br_ip *group, int type, u8 flags); 669 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 670 int type); 671 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 672 const struct sk_buff *skb, u8 type, u8 dir); 673 int br_multicast_init_stats(struct net_bridge *br); 674 void br_multicast_uninit_stats(struct net_bridge *br); 675 void br_multicast_get_stats(const struct net_bridge *br, 676 const struct net_bridge_port *p, 677 struct br_mcast_stats *dest); 678 679 #define mlock_dereference(X, br) \ 680 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 681 682 static inline bool br_multicast_is_router(struct net_bridge *br) 683 { 684 return br->multicast_router == 2 || 685 (br->multicast_router == 1 && 686 timer_pending(&br->multicast_router_timer)); 687 } 688 689 static inline bool 690 __br_multicast_querier_exists(struct net_bridge *br, 691 struct bridge_mcast_other_query *querier, 692 const bool is_ipv6) 693 { 694 bool own_querier_enabled; 695 696 if (br->multicast_querier) { 697 if (is_ipv6 && !br->has_ipv6_addr) 698 own_querier_enabled = false; 699 else 700 own_querier_enabled = true; 701 } else { 702 own_querier_enabled = false; 703 } 704 705 return time_is_before_jiffies(querier->delay_time) && 706 (own_querier_enabled || timer_pending(&querier->timer)); 707 } 708 709 static inline bool br_multicast_querier_exists(struct net_bridge *br, 710 struct ethhdr *eth) 711 { 712 switch (eth->h_proto) { 713 case (htons(ETH_P_IP)): 714 return __br_multicast_querier_exists(br, 715 &br->ip4_other_query, false); 716 #if IS_ENABLED(CONFIG_IPV6) 717 case (htons(ETH_P_IPV6)): 718 return __br_multicast_querier_exists(br, 719 &br->ip6_other_query, true); 720 #endif 721 default: 722 return false; 723 } 724 } 725 726 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 727 { 728 return BR_INPUT_SKB_CB(skb)->igmp; 729 } 730 #else 731 static inline int br_multicast_rcv(struct net_bridge *br, 732 struct net_bridge_port *port, 733 struct sk_buff *skb, 734 u16 vid) 735 { 736 return 0; 737 } 738 739 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 740 struct sk_buff *skb, u16 vid) 741 { 742 return NULL; 743 } 744 745 static inline int br_multicast_add_port(struct net_bridge_port *port) 746 { 747 return 0; 748 } 749 750 static inline void br_multicast_del_port(struct net_bridge_port *port) 751 { 752 } 753 754 static inline void br_multicast_enable_port(struct net_bridge_port *port) 755 { 756 } 757 758 static inline void br_multicast_disable_port(struct net_bridge_port *port) 759 { 760 } 761 762 static inline void br_multicast_init(struct net_bridge *br) 763 { 764 } 765 766 static inline void br_multicast_open(struct net_bridge *br) 767 { 768 } 769 770 static inline void br_multicast_stop(struct net_bridge *br) 771 { 772 } 773 774 static inline void br_multicast_dev_del(struct net_bridge *br) 775 { 776 } 777 778 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 779 struct sk_buff *skb, 780 bool local_rcv, bool local_orig) 781 { 782 } 783 784 static inline bool br_multicast_is_router(struct net_bridge *br) 785 { 786 return false; 787 } 788 789 static inline bool br_multicast_querier_exists(struct net_bridge *br, 790 struct ethhdr *eth) 791 { 792 return false; 793 } 794 795 static inline void br_mdb_init(void) 796 { 797 } 798 799 static inline void br_mdb_uninit(void) 800 { 801 } 802 803 static inline void br_multicast_count(struct net_bridge *br, 804 const struct net_bridge_port *p, 805 const struct sk_buff *skb, 806 u8 type, u8 dir) 807 { 808 } 809 810 static inline int br_multicast_init_stats(struct net_bridge *br) 811 { 812 return 0; 813 } 814 815 static inline void br_multicast_uninit_stats(struct net_bridge *br) 816 { 817 } 818 819 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 820 { 821 return 0; 822 } 823 #endif 824 825 /* br_vlan.c */ 826 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 827 bool br_allowed_ingress(const struct net_bridge *br, 828 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 829 u16 *vid); 830 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 831 const struct sk_buff *skb); 832 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 833 struct sk_buff *br_handle_vlan(struct net_bridge *br, 834 const struct net_bridge_port *port, 835 struct net_bridge_vlan_group *vg, 836 struct sk_buff *skb); 837 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 838 bool *changed); 839 int br_vlan_delete(struct net_bridge *br, u16 vid); 840 void br_vlan_flush(struct net_bridge *br); 841 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 842 void br_recalculate_fwd_mask(struct net_bridge *br); 843 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 844 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 845 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 846 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 847 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 848 int br_vlan_init(struct net_bridge *br); 849 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 850 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 851 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 852 bool *changed); 853 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 854 void nbp_vlan_flush(struct net_bridge_port *port); 855 int nbp_vlan_init(struct net_bridge_port *port); 856 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 857 void br_vlan_get_stats(const struct net_bridge_vlan *v, 858 struct br_vlan_stats *stats); 859 860 static inline struct net_bridge_vlan_group *br_vlan_group( 861 const struct net_bridge *br) 862 { 863 return rtnl_dereference(br->vlgrp); 864 } 865 866 static inline struct net_bridge_vlan_group *nbp_vlan_group( 867 const struct net_bridge_port *p) 868 { 869 return rtnl_dereference(p->vlgrp); 870 } 871 872 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 873 const struct net_bridge *br) 874 { 875 return rcu_dereference(br->vlgrp); 876 } 877 878 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 879 const struct net_bridge_port *p) 880 { 881 return rcu_dereference(p->vlgrp); 882 } 883 884 /* Since bridge now depends on 8021Q module, but the time bridge sees the 885 * skb, the vlan tag will always be present if the frame was tagged. 886 */ 887 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 888 { 889 int err = 0; 890 891 if (skb_vlan_tag_present(skb)) { 892 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 893 } else { 894 *vid = 0; 895 err = -EINVAL; 896 } 897 898 return err; 899 } 900 901 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 902 { 903 if (!vg) 904 return 0; 905 906 smp_rmb(); 907 return vg->pvid; 908 } 909 910 #else 911 static inline bool br_allowed_ingress(const struct net_bridge *br, 912 struct net_bridge_vlan_group *vg, 913 struct sk_buff *skb, 914 u16 *vid) 915 { 916 return true; 917 } 918 919 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 920 const struct sk_buff *skb) 921 { 922 return true; 923 } 924 925 static inline bool br_should_learn(struct net_bridge_port *p, 926 struct sk_buff *skb, u16 *vid) 927 { 928 return true; 929 } 930 931 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 932 const struct net_bridge_port *port, 933 struct net_bridge_vlan_group *vg, 934 struct sk_buff *skb) 935 { 936 return skb; 937 } 938 939 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 940 bool *changed) 941 { 942 *changed = false; 943 return -EOPNOTSUPP; 944 } 945 946 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 947 { 948 return -EOPNOTSUPP; 949 } 950 951 static inline void br_vlan_flush(struct net_bridge *br) 952 { 953 } 954 955 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 956 { 957 } 958 959 static inline int br_vlan_init(struct net_bridge *br) 960 { 961 return 0; 962 } 963 964 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 965 bool *changed) 966 { 967 *changed = false; 968 return -EOPNOTSUPP; 969 } 970 971 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 972 { 973 return -EOPNOTSUPP; 974 } 975 976 static inline void nbp_vlan_flush(struct net_bridge_port *port) 977 { 978 } 979 980 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 981 u16 vid) 982 { 983 return NULL; 984 } 985 986 static inline int nbp_vlan_init(struct net_bridge_port *port) 987 { 988 return 0; 989 } 990 991 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 992 { 993 return 0; 994 } 995 996 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 997 { 998 return 0; 999 } 1000 1001 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1002 unsigned long val) 1003 { 1004 return -EOPNOTSUPP; 1005 } 1006 1007 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1008 u32 filter_mask) 1009 { 1010 return 0; 1011 } 1012 1013 static inline struct net_bridge_vlan_group *br_vlan_group( 1014 const struct net_bridge *br) 1015 { 1016 return NULL; 1017 } 1018 1019 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1020 const struct net_bridge_port *p) 1021 { 1022 return NULL; 1023 } 1024 1025 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1026 const struct net_bridge *br) 1027 { 1028 return NULL; 1029 } 1030 1031 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1032 const struct net_bridge_port *p) 1033 { 1034 return NULL; 1035 } 1036 1037 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1038 struct br_vlan_stats *stats) 1039 { 1040 } 1041 #endif 1042 1043 struct nf_br_ops { 1044 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1045 }; 1046 extern const struct nf_br_ops __rcu *nf_br_ops; 1047 1048 /* br_netfilter.c */ 1049 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1050 int br_nf_core_init(void); 1051 void br_nf_core_fini(void); 1052 void br_netfilter_rtable_init(struct net_bridge *); 1053 #else 1054 static inline int br_nf_core_init(void) { return 0; } 1055 static inline void br_nf_core_fini(void) {} 1056 #define br_netfilter_rtable_init(x) 1057 #endif 1058 1059 /* br_stp.c */ 1060 void br_set_state(struct net_bridge_port *p, unsigned int state); 1061 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1062 void br_init_port(struct net_bridge_port *p); 1063 void br_become_designated_port(struct net_bridge_port *p); 1064 1065 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1066 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1067 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1068 int br_set_max_age(struct net_bridge *br, unsigned long x); 1069 int __set_ageing_time(struct net_device *dev, unsigned long t); 1070 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1071 1072 1073 /* br_stp_if.c */ 1074 void br_stp_enable_bridge(struct net_bridge *br); 1075 void br_stp_disable_bridge(struct net_bridge *br); 1076 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1077 void br_stp_enable_port(struct net_bridge_port *p); 1078 void br_stp_disable_port(struct net_bridge_port *p); 1079 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1080 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1081 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1082 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1083 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1084 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1085 1086 /* br_stp_bpdu.c */ 1087 struct stp_proto; 1088 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1089 struct net_device *dev); 1090 1091 /* br_stp_timer.c */ 1092 void br_stp_timer_init(struct net_bridge *br); 1093 void br_stp_port_timer_init(struct net_bridge_port *p); 1094 unsigned long br_timer_value(const struct timer_list *timer); 1095 1096 /* br.c */ 1097 #if IS_ENABLED(CONFIG_ATM_LANE) 1098 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1099 #endif 1100 1101 /* br_netlink.c */ 1102 extern struct rtnl_link_ops br_link_ops; 1103 int br_netlink_init(void); 1104 void br_netlink_fini(void); 1105 void br_ifinfo_notify(int event, const struct net_bridge *br, 1106 const struct net_bridge_port *port); 1107 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1108 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1109 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1110 u32 filter_mask, int nlflags); 1111 1112 #ifdef CONFIG_SYSFS 1113 /* br_sysfs_if.c */ 1114 extern const struct sysfs_ops brport_sysfs_ops; 1115 int br_sysfs_addif(struct net_bridge_port *p); 1116 int br_sysfs_renameif(struct net_bridge_port *p); 1117 1118 /* br_sysfs_br.c */ 1119 int br_sysfs_addbr(struct net_device *dev); 1120 void br_sysfs_delbr(struct net_device *dev); 1121 1122 #else 1123 1124 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1125 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1126 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1127 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1128 #endif /* CONFIG_SYSFS */ 1129 1130 /* br_switchdev.c */ 1131 #ifdef CONFIG_NET_SWITCHDEV 1132 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1133 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1134 struct sk_buff *skb); 1135 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1136 const struct sk_buff *skb); 1137 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1138 unsigned long flags, 1139 unsigned long mask); 1140 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1141 int type); 1142 1143 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1144 { 1145 skb->offload_fwd_mark = 0; 1146 } 1147 #else 1148 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1149 { 1150 return 0; 1151 } 1152 1153 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1154 struct sk_buff *skb) 1155 { 1156 } 1157 1158 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1159 const struct sk_buff *skb) 1160 { 1161 return true; 1162 } 1163 1164 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1165 unsigned long flags, 1166 unsigned long mask) 1167 { 1168 return 0; 1169 } 1170 1171 static inline void 1172 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1173 { 1174 } 1175 1176 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1177 { 1178 } 1179 #endif /* CONFIG_NET_SWITCHDEV */ 1180 1181 /* br_arp_nd_proxy.c */ 1182 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1183 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1184 u16 vid, struct net_bridge_port *p); 1185 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1186 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1187 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1188 #endif 1189