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 #define BR_GROUPFWD_RESTRICTED 0x0007u 40 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 41 #define BR_GROUPFWD_8021AD 0xB801u 42 43 /* Path to usermode spanning tree program */ 44 #define BR_STP_PROG "/sbin/bridge-stp" 45 46 typedef struct bridge_id bridge_id; 47 typedef struct mac_addr mac_addr; 48 typedef __u16 port_id; 49 50 struct bridge_id 51 { 52 unsigned char prio[2]; 53 unsigned char addr[ETH_ALEN]; 54 }; 55 56 struct mac_addr 57 { 58 unsigned char addr[ETH_ALEN]; 59 }; 60 61 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 62 /* our own querier */ 63 struct bridge_mcast_own_query { 64 struct timer_list timer; 65 u32 startup_sent; 66 }; 67 68 /* other querier */ 69 struct bridge_mcast_other_query { 70 struct timer_list timer; 71 unsigned long delay_time; 72 }; 73 74 /* selected querier */ 75 struct bridge_mcast_querier { 76 struct br_ip addr; 77 struct net_bridge_port __rcu *port; 78 }; 79 80 /* IGMP/MLD statistics */ 81 struct bridge_mcast_stats { 82 struct br_mcast_stats mstats; 83 struct u64_stats_sync syncp; 84 }; 85 #endif 86 87 struct br_vlan_stats { 88 u64 rx_bytes; 89 u64 rx_packets; 90 u64 tx_bytes; 91 u64 tx_packets; 92 struct u64_stats_sync syncp; 93 }; 94 95 struct br_tunnel_info { 96 __be64 tunnel_id; 97 struct metadata_dst *tunnel_dst; 98 }; 99 100 /** 101 * struct net_bridge_vlan - per-vlan entry 102 * 103 * @vnode: rhashtable member 104 * @vid: VLAN id 105 * @flags: bridge vlan flags 106 * @stats: per-cpu VLAN statistics 107 * @br: if MASTER flag set, this points to a bridge struct 108 * @port: if MASTER flag unset, this points to a port struct 109 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 110 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 111 * for this VLAN entry 112 * @vlist: sorted list of VLAN entries 113 * @rcu: used for entry destruction 114 * 115 * This structure is shared between the global per-VLAN entries contained in 116 * the bridge rhashtable and the local per-port per-VLAN entries contained in 117 * the port's rhashtable. The union entries should be interpreted depending on 118 * the entry flags that are set. 119 */ 120 struct net_bridge_vlan { 121 struct rhash_head vnode; 122 struct rhash_head tnode; 123 u16 vid; 124 u16 flags; 125 struct br_vlan_stats __percpu *stats; 126 union { 127 struct net_bridge *br; 128 struct net_bridge_port *port; 129 }; 130 union { 131 refcount_t refcnt; 132 struct net_bridge_vlan *brvlan; 133 }; 134 135 struct br_tunnel_info tinfo; 136 137 struct list_head vlist; 138 139 struct rcu_head rcu; 140 }; 141 142 /** 143 * struct net_bridge_vlan_group 144 * 145 * @vlan_hash: VLAN entry rhashtable 146 * @vlan_list: sorted VLAN entry list 147 * @num_vlans: number of total VLAN entries 148 * @pvid: PVID VLAN id 149 * 150 * IMPORTANT: Be careful when checking if there're VLAN entries using list 151 * primitives because the bridge can have entries in its list which 152 * are just for global context but not for filtering, i.e. they have 153 * the master flag set but not the brentry flag. If you have to check 154 * if there're "real" entries in the bridge please test @num_vlans 155 */ 156 struct net_bridge_vlan_group { 157 struct rhashtable vlan_hash; 158 struct rhashtable tunnel_hash; 159 struct list_head vlan_list; 160 u16 num_vlans; 161 u16 pvid; 162 }; 163 164 struct net_bridge_fdb_entry { 165 struct hlist_node hlist; 166 struct net_bridge_port *dst; 167 168 mac_addr addr; 169 __u16 vlan_id; 170 unsigned char is_local:1, 171 is_static:1, 172 added_by_user:1, 173 added_by_external_learn:1, 174 offloaded:1; 175 176 /* write-heavy members should not affect lookups */ 177 unsigned long updated ____cacheline_aligned_in_smp; 178 unsigned long used; 179 180 struct rcu_head rcu; 181 }; 182 183 #define MDB_PG_FLAGS_PERMANENT BIT(0) 184 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 185 186 struct net_bridge_port_group { 187 struct net_bridge_port *port; 188 struct net_bridge_port_group __rcu *next; 189 struct hlist_node mglist; 190 struct rcu_head rcu; 191 struct timer_list timer; 192 struct br_ip addr; 193 unsigned char flags; 194 unsigned char eth_addr[ETH_ALEN]; 195 }; 196 197 struct net_bridge_mdb_entry 198 { 199 struct hlist_node hlist[2]; 200 struct net_bridge *br; 201 struct net_bridge_port_group __rcu *ports; 202 struct rcu_head rcu; 203 struct timer_list timer; 204 struct br_ip addr; 205 bool mglist; 206 }; 207 208 struct net_bridge_mdb_htable 209 { 210 struct hlist_head *mhash; 211 struct rcu_head rcu; 212 struct net_bridge_mdb_htable *old; 213 u32 size; 214 u32 max; 215 u32 secret; 216 u32 ver; 217 }; 218 219 struct net_bridge_port { 220 struct net_bridge *br; 221 struct net_device *dev; 222 struct list_head list; 223 224 unsigned long flags; 225 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 226 struct net_bridge_vlan_group __rcu *vlgrp; 227 #endif 228 229 /* STP */ 230 u8 priority; 231 u8 state; 232 u16 port_no; 233 unsigned char topology_change_ack; 234 unsigned char config_pending; 235 port_id port_id; 236 port_id designated_port; 237 bridge_id designated_root; 238 bridge_id designated_bridge; 239 u32 path_cost; 240 u32 designated_cost; 241 unsigned long designated_age; 242 243 struct timer_list forward_delay_timer; 244 struct timer_list hold_timer; 245 struct timer_list message_age_timer; 246 struct kobject kobj; 247 struct rcu_head rcu; 248 249 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 250 struct bridge_mcast_own_query ip4_own_query; 251 #if IS_ENABLED(CONFIG_IPV6) 252 struct bridge_mcast_own_query ip6_own_query; 253 #endif /* IS_ENABLED(CONFIG_IPV6) */ 254 unsigned char multicast_router; 255 struct bridge_mcast_stats __percpu *mcast_stats; 256 struct timer_list multicast_router_timer; 257 struct hlist_head mglist; 258 struct hlist_node rlist; 259 #endif 260 261 #ifdef CONFIG_SYSFS 262 char sysfs_name[IFNAMSIZ]; 263 #endif 264 265 #ifdef CONFIG_NET_POLL_CONTROLLER 266 struct netpoll *np; 267 #endif 268 #ifdef CONFIG_NET_SWITCHDEV 269 int offload_fwd_mark; 270 #endif 271 }; 272 273 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 274 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 275 276 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 277 278 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 279 { 280 return rcu_dereference(dev->rx_handler_data); 281 } 282 283 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 284 { 285 return br_port_exists(dev) ? 286 rtnl_dereference(dev->rx_handler_data) : NULL; 287 } 288 289 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 290 { 291 return br_port_exists(dev) ? 292 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 293 } 294 295 struct net_bridge { 296 spinlock_t lock; 297 spinlock_t hash_lock; 298 struct list_head port_list; 299 struct net_device *dev; 300 struct pcpu_sw_netstats __percpu *stats; 301 /* These fields are accessed on each packet */ 302 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 303 u8 vlan_enabled; 304 u8 vlan_stats_enabled; 305 __be16 vlan_proto; 306 u16 default_pvid; 307 struct net_bridge_vlan_group __rcu *vlgrp; 308 #endif 309 310 struct hlist_head hash[BR_HASH_SIZE]; 311 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 312 union { 313 struct rtable fake_rtable; 314 struct rt6_info fake_rt6_info; 315 }; 316 bool nf_call_iptables; 317 bool nf_call_ip6tables; 318 bool nf_call_arptables; 319 #endif 320 u16 group_fwd_mask; 321 u16 group_fwd_mask_required; 322 323 /* STP */ 324 bridge_id designated_root; 325 bridge_id bridge_id; 326 u32 root_path_cost; 327 unsigned char topology_change; 328 unsigned char topology_change_detected; 329 u16 root_port; 330 unsigned long max_age; 331 unsigned long hello_time; 332 unsigned long forward_delay; 333 unsigned long ageing_time; 334 unsigned long bridge_max_age; 335 unsigned long bridge_hello_time; 336 unsigned long bridge_forward_delay; 337 unsigned long bridge_ageing_time; 338 339 u8 group_addr[ETH_ALEN]; 340 bool group_addr_set; 341 342 enum { 343 BR_NO_STP, /* no spanning tree */ 344 BR_KERNEL_STP, /* old STP in kernel */ 345 BR_USER_STP, /* new RSTP in userspace */ 346 } stp_enabled; 347 348 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 349 unsigned char multicast_router; 350 351 u8 multicast_disabled:1; 352 u8 multicast_querier:1; 353 u8 multicast_query_use_ifaddr:1; 354 u8 has_ipv6_addr:1; 355 u8 multicast_stats_enabled:1; 356 357 u32 hash_elasticity; 358 u32 hash_max; 359 360 u32 multicast_last_member_count; 361 u32 multicast_startup_query_count; 362 363 u8 multicast_igmp_version; 364 365 unsigned long multicast_last_member_interval; 366 unsigned long multicast_membership_interval; 367 unsigned long multicast_querier_interval; 368 unsigned long multicast_query_interval; 369 unsigned long multicast_query_response_interval; 370 unsigned long multicast_startup_query_interval; 371 372 spinlock_t multicast_lock; 373 struct net_bridge_mdb_htable __rcu *mdb; 374 struct hlist_head router_list; 375 376 struct timer_list multicast_router_timer; 377 struct bridge_mcast_other_query ip4_other_query; 378 struct bridge_mcast_own_query ip4_own_query; 379 struct bridge_mcast_querier ip4_querier; 380 struct bridge_mcast_stats __percpu *mcast_stats; 381 #if IS_ENABLED(CONFIG_IPV6) 382 struct bridge_mcast_other_query ip6_other_query; 383 struct bridge_mcast_own_query ip6_own_query; 384 struct bridge_mcast_querier ip6_querier; 385 u8 multicast_mld_version; 386 #endif /* IS_ENABLED(CONFIG_IPV6) */ 387 #endif 388 389 struct timer_list hello_timer; 390 struct timer_list tcn_timer; 391 struct timer_list topology_change_timer; 392 struct delayed_work gc_work; 393 struct kobject *ifobj; 394 u32 auto_cnt; 395 396 #ifdef CONFIG_NET_SWITCHDEV 397 int offload_fwd_mark; 398 #endif 399 }; 400 401 struct br_input_skb_cb { 402 struct net_device *brdev; 403 404 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 405 int igmp; 406 int mrouters_only; 407 #endif 408 409 bool proxyarp_replied; 410 411 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 412 bool vlan_filtered; 413 #endif 414 415 #ifdef CONFIG_NET_SWITCHDEV 416 int offload_fwd_mark; 417 #endif 418 }; 419 420 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 421 422 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 423 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 424 #else 425 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 426 #endif 427 428 #define br_printk(level, br, format, args...) \ 429 printk(level "%s: " format, (br)->dev->name, ##args) 430 431 #define br_err(__br, format, args...) \ 432 br_printk(KERN_ERR, __br, format, ##args) 433 #define br_warn(__br, format, args...) \ 434 br_printk(KERN_WARNING, __br, format, ##args) 435 #define br_notice(__br, format, args...) \ 436 br_printk(KERN_NOTICE, __br, format, ##args) 437 #define br_info(__br, format, args...) \ 438 br_printk(KERN_INFO, __br, format, ##args) 439 440 #define br_debug(br, format, args...) \ 441 pr_debug("%s: " format, (br)->dev->name, ##args) 442 443 /* called under bridge lock */ 444 static inline int br_is_root_bridge(const struct net_bridge *br) 445 { 446 return !memcmp(&br->bridge_id, &br->designated_root, 8); 447 } 448 449 /* check if a VLAN entry is global */ 450 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 451 { 452 return v->flags & BRIDGE_VLAN_INFO_MASTER; 453 } 454 455 /* check if a VLAN entry is used by the bridge */ 456 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 457 { 458 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 459 } 460 461 /* check if we should use the vlan entry, returns false if it's only context */ 462 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 463 { 464 if (br_vlan_is_master(v)) { 465 if (br_vlan_is_brentry(v)) 466 return true; 467 else 468 return false; 469 } 470 471 return true; 472 } 473 474 /* br_device.c */ 475 void br_dev_setup(struct net_device *dev); 476 void br_dev_delete(struct net_device *dev, struct list_head *list); 477 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 478 #ifdef CONFIG_NET_POLL_CONTROLLER 479 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 480 struct sk_buff *skb) 481 { 482 struct netpoll *np = p->np; 483 484 if (np) 485 netpoll_send_skb(np, skb); 486 } 487 488 int br_netpoll_enable(struct net_bridge_port *p); 489 void br_netpoll_disable(struct net_bridge_port *p); 490 #else 491 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 492 struct sk_buff *skb) 493 { 494 } 495 496 static inline int br_netpoll_enable(struct net_bridge_port *p) 497 { 498 return 0; 499 } 500 501 static inline void br_netpoll_disable(struct net_bridge_port *p) 502 { 503 } 504 #endif 505 506 /* br_fdb.c */ 507 int br_fdb_init(void); 508 void br_fdb_fini(void); 509 void br_fdb_flush(struct net_bridge *br); 510 void br_fdb_find_delete_local(struct net_bridge *br, 511 const struct net_bridge_port *p, 512 const unsigned char *addr, u16 vid); 513 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 514 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 515 void br_fdb_cleanup(struct work_struct *work); 516 void br_fdb_delete_by_port(struct net_bridge *br, 517 const struct net_bridge_port *p, u16 vid, int do_all); 518 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 519 const unsigned char *addr, 520 __u16 vid); 521 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 522 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 523 unsigned long off); 524 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 525 const unsigned char *addr, u16 vid); 526 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 527 const unsigned char *addr, u16 vid, bool added_by_user); 528 529 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 530 struct net_device *dev, const unsigned char *addr, u16 vid); 531 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 532 const unsigned char *addr, u16 vid, u16 nlh_flags); 533 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 534 struct net_device *dev, struct net_device *fdev, int *idx); 535 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 536 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 537 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 538 const unsigned char *addr, u16 vid); 539 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 540 const unsigned char *addr, u16 vid); 541 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 542 const unsigned char *addr, u16 vid); 543 544 /* br_forward.c */ 545 enum br_pkt_type { 546 BR_PKT_UNICAST, 547 BR_PKT_MULTICAST, 548 BR_PKT_BROADCAST 549 }; 550 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 551 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 552 bool local_rcv, bool local_orig); 553 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 554 void br_flood(struct net_bridge *br, struct sk_buff *skb, 555 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 556 557 /* br_if.c */ 558 void br_port_carrier_check(struct net_bridge_port *p); 559 int br_add_bridge(struct net *net, const char *name); 560 int br_del_bridge(struct net *net, const char *name); 561 int br_add_if(struct net_bridge *br, struct net_device *dev); 562 int br_del_if(struct net_bridge *br, struct net_device *dev); 563 int br_min_mtu(const struct net_bridge *br); 564 netdev_features_t br_features_recompute(struct net_bridge *br, 565 netdev_features_t features); 566 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 567 void br_manage_promisc(struct net_bridge *br); 568 569 /* br_input.c */ 570 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 571 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 572 573 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 574 { 575 return rcu_dereference(dev->rx_handler) == br_handle_frame; 576 } 577 578 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 579 { 580 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 581 } 582 583 /* br_ioctl.c */ 584 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 585 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 586 void __user *arg); 587 588 /* br_multicast.c */ 589 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 590 extern unsigned int br_mdb_rehash_seq; 591 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 592 struct sk_buff *skb, u16 vid); 593 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 594 struct sk_buff *skb, u16 vid); 595 int br_multicast_add_port(struct net_bridge_port *port); 596 void br_multicast_del_port(struct net_bridge_port *port); 597 void br_multicast_enable_port(struct net_bridge_port *port); 598 void br_multicast_disable_port(struct net_bridge_port *port); 599 void br_multicast_init(struct net_bridge *br); 600 void br_multicast_open(struct net_bridge *br); 601 void br_multicast_stop(struct net_bridge *br); 602 void br_multicast_dev_del(struct net_bridge *br); 603 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 604 struct sk_buff *skb, bool local_rcv, bool local_orig); 605 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 606 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 607 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 608 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 609 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 610 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 611 #if IS_ENABLED(CONFIG_IPV6) 612 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 613 #endif 614 struct net_bridge_mdb_entry * 615 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 616 struct net_bridge_mdb_entry * 617 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 618 struct br_ip *group); 619 void br_multicast_free_pg(struct rcu_head *head); 620 struct net_bridge_port_group * 621 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 622 struct net_bridge_port_group __rcu *next, 623 unsigned char flags, const unsigned char *src); 624 void br_mdb_init(void); 625 void br_mdb_uninit(void); 626 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 627 struct br_ip *group, int type, u8 flags); 628 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 629 int type); 630 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 631 const struct sk_buff *skb, u8 type, u8 dir); 632 int br_multicast_init_stats(struct net_bridge *br); 633 void br_multicast_uninit_stats(struct net_bridge *br); 634 void br_multicast_get_stats(const struct net_bridge *br, 635 const struct net_bridge_port *p, 636 struct br_mcast_stats *dest); 637 638 #define mlock_dereference(X, br) \ 639 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 640 641 static inline bool br_multicast_is_router(struct net_bridge *br) 642 { 643 return br->multicast_router == 2 || 644 (br->multicast_router == 1 && 645 timer_pending(&br->multicast_router_timer)); 646 } 647 648 static inline bool 649 __br_multicast_querier_exists(struct net_bridge *br, 650 struct bridge_mcast_other_query *querier, 651 const bool is_ipv6) 652 { 653 bool own_querier_enabled; 654 655 if (br->multicast_querier) { 656 if (is_ipv6 && !br->has_ipv6_addr) 657 own_querier_enabled = false; 658 else 659 own_querier_enabled = true; 660 } else { 661 own_querier_enabled = false; 662 } 663 664 return time_is_before_jiffies(querier->delay_time) && 665 (own_querier_enabled || timer_pending(&querier->timer)); 666 } 667 668 static inline bool br_multicast_querier_exists(struct net_bridge *br, 669 struct ethhdr *eth) 670 { 671 switch (eth->h_proto) { 672 case (htons(ETH_P_IP)): 673 return __br_multicast_querier_exists(br, 674 &br->ip4_other_query, false); 675 #if IS_ENABLED(CONFIG_IPV6) 676 case (htons(ETH_P_IPV6)): 677 return __br_multicast_querier_exists(br, 678 &br->ip6_other_query, true); 679 #endif 680 default: 681 return false; 682 } 683 } 684 685 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 686 { 687 return BR_INPUT_SKB_CB(skb)->igmp; 688 } 689 #else 690 static inline int br_multicast_rcv(struct net_bridge *br, 691 struct net_bridge_port *port, 692 struct sk_buff *skb, 693 u16 vid) 694 { 695 return 0; 696 } 697 698 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 699 struct sk_buff *skb, u16 vid) 700 { 701 return NULL; 702 } 703 704 static inline int br_multicast_add_port(struct net_bridge_port *port) 705 { 706 return 0; 707 } 708 709 static inline void br_multicast_del_port(struct net_bridge_port *port) 710 { 711 } 712 713 static inline void br_multicast_enable_port(struct net_bridge_port *port) 714 { 715 } 716 717 static inline void br_multicast_disable_port(struct net_bridge_port *port) 718 { 719 } 720 721 static inline void br_multicast_init(struct net_bridge *br) 722 { 723 } 724 725 static inline void br_multicast_open(struct net_bridge *br) 726 { 727 } 728 729 static inline void br_multicast_stop(struct net_bridge *br) 730 { 731 } 732 733 static inline void br_multicast_dev_del(struct net_bridge *br) 734 { 735 } 736 737 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 738 struct sk_buff *skb, 739 bool local_rcv, bool local_orig) 740 { 741 } 742 743 static inline bool br_multicast_is_router(struct net_bridge *br) 744 { 745 return 0; 746 } 747 748 static inline bool br_multicast_querier_exists(struct net_bridge *br, 749 struct ethhdr *eth) 750 { 751 return false; 752 } 753 754 static inline void br_mdb_init(void) 755 { 756 } 757 758 static inline void br_mdb_uninit(void) 759 { 760 } 761 762 static inline void br_multicast_count(struct net_bridge *br, 763 const struct net_bridge_port *p, 764 const struct sk_buff *skb, 765 u8 type, u8 dir) 766 { 767 } 768 769 static inline int br_multicast_init_stats(struct net_bridge *br) 770 { 771 return 0; 772 } 773 774 static inline void br_multicast_uninit_stats(struct net_bridge *br) 775 { 776 } 777 778 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 779 { 780 return 0; 781 } 782 #endif 783 784 /* br_vlan.c */ 785 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 786 bool br_allowed_ingress(const struct net_bridge *br, 787 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 788 u16 *vid); 789 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 790 const struct sk_buff *skb); 791 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 792 struct sk_buff *br_handle_vlan(struct net_bridge *br, 793 const struct net_bridge_port *port, 794 struct net_bridge_vlan_group *vg, 795 struct sk_buff *skb); 796 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 797 int br_vlan_delete(struct net_bridge *br, u16 vid); 798 void br_vlan_flush(struct net_bridge *br); 799 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 800 void br_recalculate_fwd_mask(struct net_bridge *br); 801 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 802 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 803 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 804 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 805 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 806 int br_vlan_init(struct net_bridge *br); 807 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 808 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 809 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 810 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 811 void nbp_vlan_flush(struct net_bridge_port *port); 812 int nbp_vlan_init(struct net_bridge_port *port); 813 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 814 void br_vlan_get_stats(const struct net_bridge_vlan *v, 815 struct br_vlan_stats *stats); 816 817 static inline struct net_bridge_vlan_group *br_vlan_group( 818 const struct net_bridge *br) 819 { 820 return rtnl_dereference(br->vlgrp); 821 } 822 823 static inline struct net_bridge_vlan_group *nbp_vlan_group( 824 const struct net_bridge_port *p) 825 { 826 return rtnl_dereference(p->vlgrp); 827 } 828 829 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 830 const struct net_bridge *br) 831 { 832 return rcu_dereference(br->vlgrp); 833 } 834 835 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 836 const struct net_bridge_port *p) 837 { 838 return rcu_dereference(p->vlgrp); 839 } 840 841 /* Since bridge now depends on 8021Q module, but the time bridge sees the 842 * skb, the vlan tag will always be present if the frame was tagged. 843 */ 844 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 845 { 846 int err = 0; 847 848 if (skb_vlan_tag_present(skb)) { 849 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 850 } else { 851 *vid = 0; 852 err = -EINVAL; 853 } 854 855 return err; 856 } 857 858 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 859 { 860 if (!vg) 861 return 0; 862 863 smp_rmb(); 864 return vg->pvid; 865 } 866 867 #else 868 static inline bool br_allowed_ingress(const struct net_bridge *br, 869 struct net_bridge_vlan_group *vg, 870 struct sk_buff *skb, 871 u16 *vid) 872 { 873 return true; 874 } 875 876 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 877 const struct sk_buff *skb) 878 { 879 return true; 880 } 881 882 static inline bool br_should_learn(struct net_bridge_port *p, 883 struct sk_buff *skb, u16 *vid) 884 { 885 return true; 886 } 887 888 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 889 const struct net_bridge_port *port, 890 struct net_bridge_vlan_group *vg, 891 struct sk_buff *skb) 892 { 893 return skb; 894 } 895 896 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 897 { 898 return -EOPNOTSUPP; 899 } 900 901 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 902 { 903 return -EOPNOTSUPP; 904 } 905 906 static inline void br_vlan_flush(struct net_bridge *br) 907 { 908 } 909 910 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 911 { 912 } 913 914 static inline int br_vlan_init(struct net_bridge *br) 915 { 916 return 0; 917 } 918 919 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 920 { 921 return -EOPNOTSUPP; 922 } 923 924 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 925 { 926 return -EOPNOTSUPP; 927 } 928 929 static inline void nbp_vlan_flush(struct net_bridge_port *port) 930 { 931 } 932 933 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 934 u16 vid) 935 { 936 return NULL; 937 } 938 939 static inline int nbp_vlan_init(struct net_bridge_port *port) 940 { 941 return 0; 942 } 943 944 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 945 { 946 return 0; 947 } 948 949 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 950 { 951 return 0; 952 } 953 954 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 955 unsigned long val) 956 { 957 return -EOPNOTSUPP; 958 } 959 960 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 961 u32 filter_mask) 962 { 963 return 0; 964 } 965 966 static inline struct net_bridge_vlan_group *br_vlan_group( 967 const struct net_bridge *br) 968 { 969 return NULL; 970 } 971 972 static inline struct net_bridge_vlan_group *nbp_vlan_group( 973 const struct net_bridge_port *p) 974 { 975 return NULL; 976 } 977 978 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 979 const struct net_bridge *br) 980 { 981 return NULL; 982 } 983 984 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 985 const struct net_bridge_port *p) 986 { 987 return NULL; 988 } 989 990 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 991 struct br_vlan_stats *stats) 992 { 993 } 994 #endif 995 996 struct nf_br_ops { 997 int (*br_dev_xmit_hook)(struct sk_buff *skb); 998 }; 999 extern const struct nf_br_ops __rcu *nf_br_ops; 1000 1001 /* br_netfilter.c */ 1002 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1003 int br_nf_core_init(void); 1004 void br_nf_core_fini(void); 1005 void br_netfilter_rtable_init(struct net_bridge *); 1006 #else 1007 static inline int br_nf_core_init(void) { return 0; } 1008 static inline void br_nf_core_fini(void) {} 1009 #define br_netfilter_rtable_init(x) 1010 #endif 1011 1012 /* br_stp.c */ 1013 void br_set_state(struct net_bridge_port *p, unsigned int state); 1014 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1015 void br_init_port(struct net_bridge_port *p); 1016 void br_become_designated_port(struct net_bridge_port *p); 1017 1018 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1019 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1020 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1021 int br_set_max_age(struct net_bridge *br, unsigned long x); 1022 int __set_ageing_time(struct net_device *dev, unsigned long t); 1023 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1024 1025 1026 /* br_stp_if.c */ 1027 void br_stp_enable_bridge(struct net_bridge *br); 1028 void br_stp_disable_bridge(struct net_bridge *br); 1029 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1030 void br_stp_enable_port(struct net_bridge_port *p); 1031 void br_stp_disable_port(struct net_bridge_port *p); 1032 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1033 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1034 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1035 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1036 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1037 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1038 1039 /* br_stp_bpdu.c */ 1040 struct stp_proto; 1041 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1042 struct net_device *dev); 1043 1044 /* br_stp_timer.c */ 1045 void br_stp_timer_init(struct net_bridge *br); 1046 void br_stp_port_timer_init(struct net_bridge_port *p); 1047 unsigned long br_timer_value(const struct timer_list *timer); 1048 1049 /* br.c */ 1050 #if IS_ENABLED(CONFIG_ATM_LANE) 1051 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1052 #endif 1053 1054 /* br_netlink.c */ 1055 extern struct rtnl_link_ops br_link_ops; 1056 int br_netlink_init(void); 1057 void br_netlink_fini(void); 1058 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1059 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1060 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1061 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1062 u32 filter_mask, int nlflags); 1063 1064 #ifdef CONFIG_SYSFS 1065 /* br_sysfs_if.c */ 1066 extern const struct sysfs_ops brport_sysfs_ops; 1067 int br_sysfs_addif(struct net_bridge_port *p); 1068 int br_sysfs_renameif(struct net_bridge_port *p); 1069 1070 /* br_sysfs_br.c */ 1071 int br_sysfs_addbr(struct net_device *dev); 1072 void br_sysfs_delbr(struct net_device *dev); 1073 1074 #else 1075 1076 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1077 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1078 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1079 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1080 #endif /* CONFIG_SYSFS */ 1081 1082 /* br_switchdev.c */ 1083 #ifdef CONFIG_NET_SWITCHDEV 1084 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1085 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1086 struct sk_buff *skb); 1087 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1088 const struct sk_buff *skb); 1089 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1090 unsigned long flags, 1091 unsigned long mask); 1092 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1093 int type); 1094 1095 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1096 { 1097 skb->offload_fwd_mark = 0; 1098 } 1099 #else 1100 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1101 { 1102 return 0; 1103 } 1104 1105 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1106 struct sk_buff *skb) 1107 { 1108 } 1109 1110 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1111 const struct sk_buff *skb) 1112 { 1113 return true; 1114 } 1115 1116 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1117 unsigned long flags, 1118 unsigned long mask) 1119 { 1120 return 0; 1121 } 1122 1123 static inline void 1124 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1125 { 1126 } 1127 1128 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1129 { 1130 } 1131 #endif /* CONFIG_NET_SWITCHDEV */ 1132 1133 #endif 1134