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_entry { 172 struct hlist_node hlist; 173 struct net_bridge_port *dst; 174 175 mac_addr addr; 176 __u16 vlan_id; 177 unsigned char is_local:1, 178 is_static:1, 179 added_by_user:1, 180 added_by_external_learn:1, 181 offloaded:1; 182 183 /* write-heavy members should not affect lookups */ 184 unsigned long updated ____cacheline_aligned_in_smp; 185 unsigned long used; 186 187 struct rcu_head rcu; 188 }; 189 190 #define MDB_PG_FLAGS_PERMANENT BIT(0) 191 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 192 193 struct net_bridge_port_group { 194 struct net_bridge_port *port; 195 struct net_bridge_port_group __rcu *next; 196 struct hlist_node mglist; 197 struct rcu_head rcu; 198 struct timer_list timer; 199 struct br_ip addr; 200 unsigned char flags; 201 unsigned char eth_addr[ETH_ALEN]; 202 }; 203 204 struct net_bridge_mdb_entry 205 { 206 struct hlist_node hlist[2]; 207 struct net_bridge *br; 208 struct net_bridge_port_group __rcu *ports; 209 struct rcu_head rcu; 210 struct timer_list timer; 211 struct br_ip addr; 212 bool mglist; 213 }; 214 215 struct net_bridge_mdb_htable 216 { 217 struct hlist_head *mhash; 218 struct rcu_head rcu; 219 struct net_bridge_mdb_htable *old; 220 u32 size; 221 u32 max; 222 u32 secret; 223 u32 ver; 224 }; 225 226 struct net_bridge_port { 227 struct net_bridge *br; 228 struct net_device *dev; 229 struct list_head list; 230 231 unsigned long flags; 232 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 233 struct net_bridge_vlan_group __rcu *vlgrp; 234 #endif 235 236 /* STP */ 237 u8 priority; 238 u8 state; 239 u16 port_no; 240 unsigned char topology_change_ack; 241 unsigned char config_pending; 242 port_id port_id; 243 port_id designated_port; 244 bridge_id designated_root; 245 bridge_id designated_bridge; 246 u32 path_cost; 247 u32 designated_cost; 248 unsigned long designated_age; 249 250 struct timer_list forward_delay_timer; 251 struct timer_list hold_timer; 252 struct timer_list message_age_timer; 253 struct kobject kobj; 254 struct rcu_head rcu; 255 256 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 257 struct bridge_mcast_own_query ip4_own_query; 258 #if IS_ENABLED(CONFIG_IPV6) 259 struct bridge_mcast_own_query ip6_own_query; 260 #endif /* IS_ENABLED(CONFIG_IPV6) */ 261 unsigned char multicast_router; 262 struct bridge_mcast_stats __percpu *mcast_stats; 263 struct timer_list multicast_router_timer; 264 struct hlist_head mglist; 265 struct hlist_node rlist; 266 #endif 267 268 #ifdef CONFIG_SYSFS 269 char sysfs_name[IFNAMSIZ]; 270 #endif 271 272 #ifdef CONFIG_NET_POLL_CONTROLLER 273 struct netpoll *np; 274 #endif 275 #ifdef CONFIG_NET_SWITCHDEV 276 int offload_fwd_mark; 277 #endif 278 u16 group_fwd_mask; 279 }; 280 281 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 282 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 283 284 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 285 286 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 287 { 288 return rcu_dereference(dev->rx_handler_data); 289 } 290 291 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 292 { 293 return br_port_exists(dev) ? 294 rtnl_dereference(dev->rx_handler_data) : NULL; 295 } 296 297 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 298 { 299 return br_port_exists(dev) ? 300 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 301 } 302 303 struct net_bridge { 304 spinlock_t lock; 305 spinlock_t hash_lock; 306 struct list_head port_list; 307 struct net_device *dev; 308 struct pcpu_sw_netstats __percpu *stats; 309 /* These fields are accessed on each packet */ 310 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 311 u8 vlan_enabled; 312 u8 vlan_stats_enabled; 313 __be16 vlan_proto; 314 u16 default_pvid; 315 struct net_bridge_vlan_group __rcu *vlgrp; 316 #endif 317 318 struct hlist_head hash[BR_HASH_SIZE]; 319 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 320 union { 321 struct rtable fake_rtable; 322 struct rt6_info fake_rt6_info; 323 }; 324 bool nf_call_iptables; 325 bool nf_call_ip6tables; 326 bool nf_call_arptables; 327 #endif 328 u16 group_fwd_mask; 329 u16 group_fwd_mask_required; 330 331 /* STP */ 332 bridge_id designated_root; 333 bridge_id bridge_id; 334 u32 root_path_cost; 335 unsigned char topology_change; 336 unsigned char topology_change_detected; 337 u16 root_port; 338 unsigned long max_age; 339 unsigned long hello_time; 340 unsigned long forward_delay; 341 unsigned long ageing_time; 342 unsigned long bridge_max_age; 343 unsigned long bridge_hello_time; 344 unsigned long bridge_forward_delay; 345 unsigned long bridge_ageing_time; 346 347 u8 group_addr[ETH_ALEN]; 348 bool group_addr_set; 349 350 enum { 351 BR_NO_STP, /* no spanning tree */ 352 BR_KERNEL_STP, /* old STP in kernel */ 353 BR_USER_STP, /* new RSTP in userspace */ 354 } stp_enabled; 355 356 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 357 unsigned char multicast_router; 358 359 u8 multicast_disabled:1; 360 u8 multicast_querier:1; 361 u8 multicast_query_use_ifaddr:1; 362 u8 has_ipv6_addr:1; 363 u8 multicast_stats_enabled:1; 364 365 u32 hash_elasticity; 366 u32 hash_max; 367 368 u32 multicast_last_member_count; 369 u32 multicast_startup_query_count; 370 371 u8 multicast_igmp_version; 372 373 unsigned long multicast_last_member_interval; 374 unsigned long multicast_membership_interval; 375 unsigned long multicast_querier_interval; 376 unsigned long multicast_query_interval; 377 unsigned long multicast_query_response_interval; 378 unsigned long multicast_startup_query_interval; 379 380 spinlock_t multicast_lock; 381 struct net_bridge_mdb_htable __rcu *mdb; 382 struct hlist_head router_list; 383 384 struct timer_list multicast_router_timer; 385 struct bridge_mcast_other_query ip4_other_query; 386 struct bridge_mcast_own_query ip4_own_query; 387 struct bridge_mcast_querier ip4_querier; 388 struct bridge_mcast_stats __percpu *mcast_stats; 389 #if IS_ENABLED(CONFIG_IPV6) 390 struct bridge_mcast_other_query ip6_other_query; 391 struct bridge_mcast_own_query ip6_own_query; 392 struct bridge_mcast_querier ip6_querier; 393 u8 multicast_mld_version; 394 #endif /* IS_ENABLED(CONFIG_IPV6) */ 395 #endif 396 397 struct timer_list hello_timer; 398 struct timer_list tcn_timer; 399 struct timer_list topology_change_timer; 400 struct delayed_work gc_work; 401 struct kobject *ifobj; 402 u32 auto_cnt; 403 404 #ifdef CONFIG_NET_SWITCHDEV 405 int offload_fwd_mark; 406 #endif 407 }; 408 409 struct br_input_skb_cb { 410 struct net_device *brdev; 411 412 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 413 int igmp; 414 int mrouters_only; 415 #endif 416 417 bool proxyarp_replied; 418 419 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 420 bool vlan_filtered; 421 #endif 422 423 #ifdef CONFIG_NET_SWITCHDEV 424 int offload_fwd_mark; 425 #endif 426 }; 427 428 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 429 430 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 431 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 432 #else 433 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 434 #endif 435 436 #define br_printk(level, br, format, args...) \ 437 printk(level "%s: " format, (br)->dev->name, ##args) 438 439 #define br_err(__br, format, args...) \ 440 br_printk(KERN_ERR, __br, format, ##args) 441 #define br_warn(__br, format, args...) \ 442 br_printk(KERN_WARNING, __br, format, ##args) 443 #define br_notice(__br, format, args...) \ 444 br_printk(KERN_NOTICE, __br, format, ##args) 445 #define br_info(__br, format, args...) \ 446 br_printk(KERN_INFO, __br, format, ##args) 447 448 #define br_debug(br, format, args...) \ 449 pr_debug("%s: " format, (br)->dev->name, ##args) 450 451 /* called under bridge lock */ 452 static inline int br_is_root_bridge(const struct net_bridge *br) 453 { 454 return !memcmp(&br->bridge_id, &br->designated_root, 8); 455 } 456 457 /* check if a VLAN entry is global */ 458 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 459 { 460 return v->flags & BRIDGE_VLAN_INFO_MASTER; 461 } 462 463 /* check if a VLAN entry is used by the bridge */ 464 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 465 { 466 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 467 } 468 469 /* check if we should use the vlan entry, returns false if it's only context */ 470 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 471 { 472 if (br_vlan_is_master(v)) { 473 if (br_vlan_is_brentry(v)) 474 return true; 475 else 476 return false; 477 } 478 479 return true; 480 } 481 482 /* br_device.c */ 483 void br_dev_setup(struct net_device *dev); 484 void br_dev_delete(struct net_device *dev, struct list_head *list); 485 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 486 #ifdef CONFIG_NET_POLL_CONTROLLER 487 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 488 struct sk_buff *skb) 489 { 490 struct netpoll *np = p->np; 491 492 if (np) 493 netpoll_send_skb(np, skb); 494 } 495 496 int br_netpoll_enable(struct net_bridge_port *p); 497 void br_netpoll_disable(struct net_bridge_port *p); 498 #else 499 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 500 struct sk_buff *skb) 501 { 502 } 503 504 static inline int br_netpoll_enable(struct net_bridge_port *p) 505 { 506 return 0; 507 } 508 509 static inline void br_netpoll_disable(struct net_bridge_port *p) 510 { 511 } 512 #endif 513 514 /* br_fdb.c */ 515 int br_fdb_init(void); 516 void br_fdb_fini(void); 517 void br_fdb_flush(struct net_bridge *br); 518 void br_fdb_find_delete_local(struct net_bridge *br, 519 const struct net_bridge_port *p, 520 const unsigned char *addr, u16 vid); 521 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 522 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 523 void br_fdb_cleanup(struct work_struct *work); 524 void br_fdb_delete_by_port(struct net_bridge *br, 525 const struct net_bridge_port *p, u16 vid, int do_all); 526 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 527 const unsigned char *addr, 528 __u16 vid); 529 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 530 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 531 unsigned long off); 532 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 533 const unsigned char *addr, u16 vid); 534 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 535 const unsigned char *addr, u16 vid, bool added_by_user); 536 537 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 538 struct net_device *dev, const unsigned char *addr, u16 vid); 539 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 540 const unsigned char *addr, u16 vid, u16 nlh_flags); 541 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 542 struct net_device *dev, struct net_device *fdev, int *idx); 543 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 544 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 545 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 546 const unsigned char *addr, u16 vid); 547 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 548 const unsigned char *addr, u16 vid); 549 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 550 const unsigned char *addr, u16 vid); 551 552 /* br_forward.c */ 553 enum br_pkt_type { 554 BR_PKT_UNICAST, 555 BR_PKT_MULTICAST, 556 BR_PKT_BROADCAST 557 }; 558 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 559 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 560 bool local_rcv, bool local_orig); 561 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 562 void br_flood(struct net_bridge *br, struct sk_buff *skb, 563 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 564 565 /* br_if.c */ 566 void br_port_carrier_check(struct net_bridge_port *p); 567 int br_add_bridge(struct net *net, const char *name); 568 int br_del_bridge(struct net *net, const char *name); 569 int br_add_if(struct net_bridge *br, struct net_device *dev, 570 struct netlink_ext_ack *extack); 571 int br_del_if(struct net_bridge *br, struct net_device *dev); 572 int br_min_mtu(const struct net_bridge *br); 573 netdev_features_t br_features_recompute(struct net_bridge *br, 574 netdev_features_t features); 575 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 576 void br_manage_promisc(struct net_bridge *br); 577 578 /* br_input.c */ 579 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 580 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 581 582 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 583 { 584 return rcu_dereference(dev->rx_handler) == br_handle_frame; 585 } 586 587 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 588 { 589 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 590 } 591 592 /* br_ioctl.c */ 593 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 594 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 595 void __user *arg); 596 597 /* br_multicast.c */ 598 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 599 extern unsigned int br_mdb_rehash_seq; 600 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 601 struct sk_buff *skb, u16 vid); 602 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 603 struct sk_buff *skb, u16 vid); 604 int br_multicast_add_port(struct net_bridge_port *port); 605 void br_multicast_del_port(struct net_bridge_port *port); 606 void br_multicast_enable_port(struct net_bridge_port *port); 607 void br_multicast_disable_port(struct net_bridge_port *port); 608 void br_multicast_init(struct net_bridge *br); 609 void br_multicast_open(struct net_bridge *br); 610 void br_multicast_stop(struct net_bridge *br); 611 void br_multicast_dev_del(struct net_bridge *br); 612 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 613 struct sk_buff *skb, bool local_rcv, bool local_orig); 614 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 615 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 616 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 617 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 618 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 619 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 620 #if IS_ENABLED(CONFIG_IPV6) 621 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 622 #endif 623 struct net_bridge_mdb_entry * 624 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 625 struct net_bridge_mdb_entry * 626 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 627 struct br_ip *group); 628 void br_multicast_free_pg(struct rcu_head *head); 629 struct net_bridge_port_group * 630 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 631 struct net_bridge_port_group __rcu *next, 632 unsigned char flags, const unsigned char *src); 633 void br_mdb_init(void); 634 void br_mdb_uninit(void); 635 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 636 struct br_ip *group, int type, u8 flags); 637 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 638 int type); 639 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 640 const struct sk_buff *skb, u8 type, u8 dir); 641 int br_multicast_init_stats(struct net_bridge *br); 642 void br_multicast_uninit_stats(struct net_bridge *br); 643 void br_multicast_get_stats(const struct net_bridge *br, 644 const struct net_bridge_port *p, 645 struct br_mcast_stats *dest); 646 647 #define mlock_dereference(X, br) \ 648 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 649 650 static inline bool br_multicast_is_router(struct net_bridge *br) 651 { 652 return br->multicast_router == 2 || 653 (br->multicast_router == 1 && 654 timer_pending(&br->multicast_router_timer)); 655 } 656 657 static inline bool 658 __br_multicast_querier_exists(struct net_bridge *br, 659 struct bridge_mcast_other_query *querier, 660 const bool is_ipv6) 661 { 662 bool own_querier_enabled; 663 664 if (br->multicast_querier) { 665 if (is_ipv6 && !br->has_ipv6_addr) 666 own_querier_enabled = false; 667 else 668 own_querier_enabled = true; 669 } else { 670 own_querier_enabled = false; 671 } 672 673 return time_is_before_jiffies(querier->delay_time) && 674 (own_querier_enabled || timer_pending(&querier->timer)); 675 } 676 677 static inline bool br_multicast_querier_exists(struct net_bridge *br, 678 struct ethhdr *eth) 679 { 680 switch (eth->h_proto) { 681 case (htons(ETH_P_IP)): 682 return __br_multicast_querier_exists(br, 683 &br->ip4_other_query, false); 684 #if IS_ENABLED(CONFIG_IPV6) 685 case (htons(ETH_P_IPV6)): 686 return __br_multicast_querier_exists(br, 687 &br->ip6_other_query, true); 688 #endif 689 default: 690 return false; 691 } 692 } 693 694 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 695 { 696 return BR_INPUT_SKB_CB(skb)->igmp; 697 } 698 #else 699 static inline int br_multicast_rcv(struct net_bridge *br, 700 struct net_bridge_port *port, 701 struct sk_buff *skb, 702 u16 vid) 703 { 704 return 0; 705 } 706 707 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 708 struct sk_buff *skb, u16 vid) 709 { 710 return NULL; 711 } 712 713 static inline int br_multicast_add_port(struct net_bridge_port *port) 714 { 715 return 0; 716 } 717 718 static inline void br_multicast_del_port(struct net_bridge_port *port) 719 { 720 } 721 722 static inline void br_multicast_enable_port(struct net_bridge_port *port) 723 { 724 } 725 726 static inline void br_multicast_disable_port(struct net_bridge_port *port) 727 { 728 } 729 730 static inline void br_multicast_init(struct net_bridge *br) 731 { 732 } 733 734 static inline void br_multicast_open(struct net_bridge *br) 735 { 736 } 737 738 static inline void br_multicast_stop(struct net_bridge *br) 739 { 740 } 741 742 static inline void br_multicast_dev_del(struct net_bridge *br) 743 { 744 } 745 746 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 747 struct sk_buff *skb, 748 bool local_rcv, bool local_orig) 749 { 750 } 751 752 static inline bool br_multicast_is_router(struct net_bridge *br) 753 { 754 return 0; 755 } 756 757 static inline bool br_multicast_querier_exists(struct net_bridge *br, 758 struct ethhdr *eth) 759 { 760 return false; 761 } 762 763 static inline void br_mdb_init(void) 764 { 765 } 766 767 static inline void br_mdb_uninit(void) 768 { 769 } 770 771 static inline void br_multicast_count(struct net_bridge *br, 772 const struct net_bridge_port *p, 773 const struct sk_buff *skb, 774 u8 type, u8 dir) 775 { 776 } 777 778 static inline int br_multicast_init_stats(struct net_bridge *br) 779 { 780 return 0; 781 } 782 783 static inline void br_multicast_uninit_stats(struct net_bridge *br) 784 { 785 } 786 787 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 788 { 789 return 0; 790 } 791 #endif 792 793 /* br_vlan.c */ 794 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 795 bool br_allowed_ingress(const struct net_bridge *br, 796 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 797 u16 *vid); 798 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 799 const struct sk_buff *skb); 800 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 801 struct sk_buff *br_handle_vlan(struct net_bridge *br, 802 const struct net_bridge_port *port, 803 struct net_bridge_vlan_group *vg, 804 struct sk_buff *skb); 805 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 806 int br_vlan_delete(struct net_bridge *br, u16 vid); 807 void br_vlan_flush(struct net_bridge *br); 808 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 809 void br_recalculate_fwd_mask(struct net_bridge *br); 810 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 811 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 812 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 813 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 814 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 815 int br_vlan_init(struct net_bridge *br); 816 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 817 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 818 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 819 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 820 void nbp_vlan_flush(struct net_bridge_port *port); 821 int nbp_vlan_init(struct net_bridge_port *port); 822 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 823 void br_vlan_get_stats(const struct net_bridge_vlan *v, 824 struct br_vlan_stats *stats); 825 826 static inline struct net_bridge_vlan_group *br_vlan_group( 827 const struct net_bridge *br) 828 { 829 return rtnl_dereference(br->vlgrp); 830 } 831 832 static inline struct net_bridge_vlan_group *nbp_vlan_group( 833 const struct net_bridge_port *p) 834 { 835 return rtnl_dereference(p->vlgrp); 836 } 837 838 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 839 const struct net_bridge *br) 840 { 841 return rcu_dereference(br->vlgrp); 842 } 843 844 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 845 const struct net_bridge_port *p) 846 { 847 return rcu_dereference(p->vlgrp); 848 } 849 850 /* Since bridge now depends on 8021Q module, but the time bridge sees the 851 * skb, the vlan tag will always be present if the frame was tagged. 852 */ 853 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 854 { 855 int err = 0; 856 857 if (skb_vlan_tag_present(skb)) { 858 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 859 } else { 860 *vid = 0; 861 err = -EINVAL; 862 } 863 864 return err; 865 } 866 867 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 868 { 869 if (!vg) 870 return 0; 871 872 smp_rmb(); 873 return vg->pvid; 874 } 875 876 #else 877 static inline bool br_allowed_ingress(const struct net_bridge *br, 878 struct net_bridge_vlan_group *vg, 879 struct sk_buff *skb, 880 u16 *vid) 881 { 882 return true; 883 } 884 885 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 886 const struct sk_buff *skb) 887 { 888 return true; 889 } 890 891 static inline bool br_should_learn(struct net_bridge_port *p, 892 struct sk_buff *skb, u16 *vid) 893 { 894 return true; 895 } 896 897 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 898 const struct net_bridge_port *port, 899 struct net_bridge_vlan_group *vg, 900 struct sk_buff *skb) 901 { 902 return skb; 903 } 904 905 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 906 { 907 return -EOPNOTSUPP; 908 } 909 910 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 911 { 912 return -EOPNOTSUPP; 913 } 914 915 static inline void br_vlan_flush(struct net_bridge *br) 916 { 917 } 918 919 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 920 { 921 } 922 923 static inline int br_vlan_init(struct net_bridge *br) 924 { 925 return 0; 926 } 927 928 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 929 { 930 return -EOPNOTSUPP; 931 } 932 933 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 934 { 935 return -EOPNOTSUPP; 936 } 937 938 static inline void nbp_vlan_flush(struct net_bridge_port *port) 939 { 940 } 941 942 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 943 u16 vid) 944 { 945 return NULL; 946 } 947 948 static inline int nbp_vlan_init(struct net_bridge_port *port) 949 { 950 return 0; 951 } 952 953 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 954 { 955 return 0; 956 } 957 958 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 959 { 960 return 0; 961 } 962 963 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 964 unsigned long val) 965 { 966 return -EOPNOTSUPP; 967 } 968 969 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 970 u32 filter_mask) 971 { 972 return 0; 973 } 974 975 static inline struct net_bridge_vlan_group *br_vlan_group( 976 const struct net_bridge *br) 977 { 978 return NULL; 979 } 980 981 static inline struct net_bridge_vlan_group *nbp_vlan_group( 982 const struct net_bridge_port *p) 983 { 984 return NULL; 985 } 986 987 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 988 const struct net_bridge *br) 989 { 990 return NULL; 991 } 992 993 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 994 const struct net_bridge_port *p) 995 { 996 return NULL; 997 } 998 999 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1000 struct br_vlan_stats *stats) 1001 { 1002 } 1003 #endif 1004 1005 struct nf_br_ops { 1006 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1007 }; 1008 extern const struct nf_br_ops __rcu *nf_br_ops; 1009 1010 /* br_netfilter.c */ 1011 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1012 int br_nf_core_init(void); 1013 void br_nf_core_fini(void); 1014 void br_netfilter_rtable_init(struct net_bridge *); 1015 #else 1016 static inline int br_nf_core_init(void) { return 0; } 1017 static inline void br_nf_core_fini(void) {} 1018 #define br_netfilter_rtable_init(x) 1019 #endif 1020 1021 /* br_stp.c */ 1022 void br_set_state(struct net_bridge_port *p, unsigned int state); 1023 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1024 void br_init_port(struct net_bridge_port *p); 1025 void br_become_designated_port(struct net_bridge_port *p); 1026 1027 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1028 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1029 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1030 int br_set_max_age(struct net_bridge *br, unsigned long x); 1031 int __set_ageing_time(struct net_device *dev, unsigned long t); 1032 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1033 1034 1035 /* br_stp_if.c */ 1036 void br_stp_enable_bridge(struct net_bridge *br); 1037 void br_stp_disable_bridge(struct net_bridge *br); 1038 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1039 void br_stp_enable_port(struct net_bridge_port *p); 1040 void br_stp_disable_port(struct net_bridge_port *p); 1041 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1042 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1043 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1044 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1045 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1046 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1047 1048 /* br_stp_bpdu.c */ 1049 struct stp_proto; 1050 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1051 struct net_device *dev); 1052 1053 /* br_stp_timer.c */ 1054 void br_stp_timer_init(struct net_bridge *br); 1055 void br_stp_port_timer_init(struct net_bridge_port *p); 1056 unsigned long br_timer_value(const struct timer_list *timer); 1057 1058 /* br.c */ 1059 #if IS_ENABLED(CONFIG_ATM_LANE) 1060 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1061 #endif 1062 1063 /* br_netlink.c */ 1064 extern struct rtnl_link_ops br_link_ops; 1065 int br_netlink_init(void); 1066 void br_netlink_fini(void); 1067 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1068 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1069 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1070 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1071 u32 filter_mask, int nlflags); 1072 1073 #ifdef CONFIG_SYSFS 1074 /* br_sysfs_if.c */ 1075 extern const struct sysfs_ops brport_sysfs_ops; 1076 int br_sysfs_addif(struct net_bridge_port *p); 1077 int br_sysfs_renameif(struct net_bridge_port *p); 1078 1079 /* br_sysfs_br.c */ 1080 int br_sysfs_addbr(struct net_device *dev); 1081 void br_sysfs_delbr(struct net_device *dev); 1082 1083 #else 1084 1085 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1086 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1087 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1088 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1089 #endif /* CONFIG_SYSFS */ 1090 1091 /* br_switchdev.c */ 1092 #ifdef CONFIG_NET_SWITCHDEV 1093 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1094 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1095 struct sk_buff *skb); 1096 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1097 const struct sk_buff *skb); 1098 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1099 unsigned long flags, 1100 unsigned long mask); 1101 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1102 int type); 1103 1104 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1105 { 1106 skb->offload_fwd_mark = 0; 1107 } 1108 #else 1109 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1110 { 1111 return 0; 1112 } 1113 1114 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1115 struct sk_buff *skb) 1116 { 1117 } 1118 1119 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1120 const struct sk_buff *skb) 1121 { 1122 return true; 1123 } 1124 1125 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1126 unsigned long flags, 1127 unsigned long mask) 1128 { 1129 return 0; 1130 } 1131 1132 static inline void 1133 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1134 { 1135 } 1136 1137 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1138 { 1139 } 1140 #endif /* CONFIG_NET_SWITCHDEV */ 1141 1142 #endif 1143