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 25 #define BR_HASH_BITS 8 26 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 27 28 #define BR_HOLD_TIME (1*HZ) 29 30 #define BR_PORT_BITS 10 31 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 32 33 #define BR_VERSION "2.3" 34 35 /* Control of forwarding link local multicast */ 36 #define BR_GROUPFWD_DEFAULT 0 37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 38 #define BR_GROUPFWD_RESTRICTED 0x0007u 39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 40 #define BR_GROUPFWD_8021AD 0xB801u 41 42 /* Path to usermode spanning tree program */ 43 #define BR_STP_PROG "/sbin/bridge-stp" 44 45 typedef struct bridge_id bridge_id; 46 typedef struct mac_addr mac_addr; 47 typedef __u16 port_id; 48 49 struct bridge_id 50 { 51 unsigned char prio[2]; 52 unsigned char addr[ETH_ALEN]; 53 }; 54 55 struct mac_addr 56 { 57 unsigned char addr[ETH_ALEN]; 58 }; 59 60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 61 /* our own querier */ 62 struct bridge_mcast_own_query { 63 struct timer_list timer; 64 u32 startup_sent; 65 }; 66 67 /* other querier */ 68 struct bridge_mcast_other_query { 69 struct timer_list timer; 70 unsigned long delay_time; 71 }; 72 73 /* selected querier */ 74 struct bridge_mcast_querier { 75 struct br_ip addr; 76 struct net_bridge_port __rcu *port; 77 }; 78 79 /* IGMP/MLD statistics */ 80 struct bridge_mcast_stats { 81 struct br_mcast_stats mstats; 82 struct u64_stats_sync syncp; 83 }; 84 #endif 85 86 struct br_vlan_stats { 87 u64 rx_bytes; 88 u64 rx_packets; 89 u64 tx_bytes; 90 u64 tx_packets; 91 struct u64_stats_sync syncp; 92 }; 93 94 struct br_tunnel_info { 95 __be64 tunnel_id; 96 struct metadata_dst *tunnel_dst; 97 }; 98 99 /** 100 * struct net_bridge_vlan - per-vlan entry 101 * 102 * @vnode: rhashtable member 103 * @vid: VLAN id 104 * @flags: bridge vlan flags 105 * @stats: per-cpu VLAN statistics 106 * @br: if MASTER flag set, this points to a bridge struct 107 * @port: if MASTER flag unset, this points to a port struct 108 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 109 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 110 * for this VLAN entry 111 * @vlist: sorted list of VLAN entries 112 * @rcu: used for entry destruction 113 * 114 * This structure is shared between the global per-VLAN entries contained in 115 * the bridge rhashtable and the local per-port per-VLAN entries contained in 116 * the port's rhashtable. The union entries should be interpreted depending on 117 * the entry flags that are set. 118 */ 119 struct net_bridge_vlan { 120 struct rhash_head vnode; 121 struct rhash_head tnode; 122 u16 vid; 123 u16 flags; 124 struct br_vlan_stats __percpu *stats; 125 union { 126 struct net_bridge *br; 127 struct net_bridge_port *port; 128 }; 129 union { 130 atomic_t refcnt; 131 struct net_bridge_vlan *brvlan; 132 }; 133 134 struct br_tunnel_info tinfo; 135 136 struct list_head vlist; 137 138 struct rcu_head rcu; 139 }; 140 141 /** 142 * struct net_bridge_vlan_group 143 * 144 * @vlan_hash: VLAN entry rhashtable 145 * @vlan_list: sorted VLAN entry list 146 * @num_vlans: number of total VLAN entries 147 * @pvid: PVID VLAN id 148 * 149 * IMPORTANT: Be careful when checking if there're VLAN entries using list 150 * primitives because the bridge can have entries in its list which 151 * are just for global context but not for filtering, i.e. they have 152 * the master flag set but not the brentry flag. If you have to check 153 * if there're "real" entries in the bridge please test @num_vlans 154 */ 155 struct net_bridge_vlan_group { 156 struct rhashtable vlan_hash; 157 struct rhashtable tunnel_hash; 158 struct list_head vlan_list; 159 u16 num_vlans; 160 u16 pvid; 161 }; 162 163 struct net_bridge_fdb_entry { 164 struct hlist_node hlist; 165 struct net_bridge_port *dst; 166 167 mac_addr addr; 168 __u16 vlan_id; 169 unsigned char is_local:1, 170 is_static:1, 171 added_by_user:1, 172 added_by_external_learn:1, 173 offloaded:1; 174 175 /* write-heavy members should not affect lookups */ 176 unsigned long updated ____cacheline_aligned_in_smp; 177 unsigned long used; 178 179 struct rcu_head rcu; 180 }; 181 182 #define MDB_PG_FLAGS_PERMANENT BIT(0) 183 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 184 185 struct net_bridge_port_group { 186 struct net_bridge_port *port; 187 struct net_bridge_port_group __rcu *next; 188 struct hlist_node mglist; 189 struct rcu_head rcu; 190 struct timer_list timer; 191 struct br_ip addr; 192 unsigned char flags; 193 unsigned char eth_addr[ETH_ALEN]; 194 }; 195 196 struct net_bridge_mdb_entry 197 { 198 struct hlist_node hlist[2]; 199 struct net_bridge *br; 200 struct net_bridge_port_group __rcu *ports; 201 struct rcu_head rcu; 202 struct timer_list timer; 203 struct br_ip addr; 204 bool mglist; 205 }; 206 207 struct net_bridge_mdb_htable 208 { 209 struct hlist_head *mhash; 210 struct rcu_head rcu; 211 struct net_bridge_mdb_htable *old; 212 u32 size; 213 u32 max; 214 u32 secret; 215 u32 ver; 216 }; 217 218 struct net_bridge_port { 219 struct net_bridge *br; 220 struct net_device *dev; 221 struct list_head list; 222 223 unsigned long flags; 224 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 225 struct net_bridge_vlan_group __rcu *vlgrp; 226 #endif 227 228 /* STP */ 229 u8 priority; 230 u8 state; 231 u16 port_no; 232 unsigned char topology_change_ack; 233 unsigned char config_pending; 234 port_id port_id; 235 port_id designated_port; 236 bridge_id designated_root; 237 bridge_id designated_bridge; 238 u32 path_cost; 239 u32 designated_cost; 240 unsigned long designated_age; 241 242 struct timer_list forward_delay_timer; 243 struct timer_list hold_timer; 244 struct timer_list message_age_timer; 245 struct kobject kobj; 246 struct rcu_head rcu; 247 248 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 249 struct bridge_mcast_own_query ip4_own_query; 250 #if IS_ENABLED(CONFIG_IPV6) 251 struct bridge_mcast_own_query ip6_own_query; 252 #endif /* IS_ENABLED(CONFIG_IPV6) */ 253 unsigned char multicast_router; 254 struct bridge_mcast_stats __percpu *mcast_stats; 255 struct timer_list multicast_router_timer; 256 struct hlist_head mglist; 257 struct hlist_node rlist; 258 #endif 259 260 #ifdef CONFIG_SYSFS 261 char sysfs_name[IFNAMSIZ]; 262 #endif 263 264 #ifdef CONFIG_NET_POLL_CONTROLLER 265 struct netpoll *np; 266 #endif 267 #ifdef CONFIG_NET_SWITCHDEV 268 int offload_fwd_mark; 269 #endif 270 }; 271 272 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 273 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 274 275 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 276 277 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 278 { 279 return rcu_dereference(dev->rx_handler_data); 280 } 281 282 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 283 { 284 return br_port_exists(dev) ? 285 rtnl_dereference(dev->rx_handler_data) : NULL; 286 } 287 288 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 289 { 290 return br_port_exists(dev) ? 291 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 292 } 293 294 struct net_bridge { 295 spinlock_t lock; 296 spinlock_t hash_lock; 297 struct list_head port_list; 298 struct net_device *dev; 299 struct pcpu_sw_netstats __percpu *stats; 300 /* These fields are accessed on each packet */ 301 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 302 u8 vlan_enabled; 303 u8 vlan_stats_enabled; 304 __be16 vlan_proto; 305 u16 default_pvid; 306 struct net_bridge_vlan_group __rcu *vlgrp; 307 #endif 308 309 struct hlist_head hash[BR_HASH_SIZE]; 310 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 311 union { 312 struct rtable fake_rtable; 313 struct rt6_info fake_rt6_info; 314 }; 315 bool nf_call_iptables; 316 bool nf_call_ip6tables; 317 bool nf_call_arptables; 318 #endif 319 u16 group_fwd_mask; 320 u16 group_fwd_mask_required; 321 322 /* STP */ 323 bridge_id designated_root; 324 bridge_id bridge_id; 325 u32 root_path_cost; 326 unsigned char topology_change; 327 unsigned char topology_change_detected; 328 u16 root_port; 329 unsigned long max_age; 330 unsigned long hello_time; 331 unsigned long forward_delay; 332 unsigned long ageing_time; 333 unsigned long bridge_max_age; 334 unsigned long bridge_hello_time; 335 unsigned long bridge_forward_delay; 336 unsigned long bridge_ageing_time; 337 338 u8 group_addr[ETH_ALEN]; 339 bool group_addr_set; 340 341 enum { 342 BR_NO_STP, /* no spanning tree */ 343 BR_KERNEL_STP, /* old STP in kernel */ 344 BR_USER_STP, /* new RSTP in userspace */ 345 } stp_enabled; 346 347 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 348 unsigned char multicast_router; 349 350 u8 multicast_disabled:1; 351 u8 multicast_querier:1; 352 u8 multicast_query_use_ifaddr:1; 353 u8 has_ipv6_addr:1; 354 u8 multicast_stats_enabled:1; 355 356 u32 hash_elasticity; 357 u32 hash_max; 358 359 u32 multicast_last_member_count; 360 u32 multicast_startup_query_count; 361 362 u8 multicast_igmp_version; 363 364 unsigned long multicast_last_member_interval; 365 unsigned long multicast_membership_interval; 366 unsigned long multicast_querier_interval; 367 unsigned long multicast_query_interval; 368 unsigned long multicast_query_response_interval; 369 unsigned long multicast_startup_query_interval; 370 371 spinlock_t multicast_lock; 372 struct net_bridge_mdb_htable __rcu *mdb; 373 struct hlist_head router_list; 374 375 struct timer_list multicast_router_timer; 376 struct bridge_mcast_other_query ip4_other_query; 377 struct bridge_mcast_own_query ip4_own_query; 378 struct bridge_mcast_querier ip4_querier; 379 struct bridge_mcast_stats __percpu *mcast_stats; 380 #if IS_ENABLED(CONFIG_IPV6) 381 struct bridge_mcast_other_query ip6_other_query; 382 struct bridge_mcast_own_query ip6_own_query; 383 struct bridge_mcast_querier ip6_querier; 384 u8 multicast_mld_version; 385 #endif /* IS_ENABLED(CONFIG_IPV6) */ 386 #endif 387 388 struct timer_list hello_timer; 389 struct timer_list tcn_timer; 390 struct timer_list topology_change_timer; 391 struct delayed_work gc_work; 392 struct kobject *ifobj; 393 u32 auto_cnt; 394 395 #ifdef CONFIG_NET_SWITCHDEV 396 int offload_fwd_mark; 397 #endif 398 }; 399 400 struct br_input_skb_cb { 401 struct net_device *brdev; 402 403 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 404 int igmp; 405 int mrouters_only; 406 #endif 407 408 bool proxyarp_replied; 409 410 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 411 bool vlan_filtered; 412 #endif 413 414 #ifdef CONFIG_NET_SWITCHDEV 415 int offload_fwd_mark; 416 #endif 417 }; 418 419 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 420 421 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 422 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 423 #else 424 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 425 #endif 426 427 #define br_printk(level, br, format, args...) \ 428 printk(level "%s: " format, (br)->dev->name, ##args) 429 430 #define br_err(__br, format, args...) \ 431 br_printk(KERN_ERR, __br, format, ##args) 432 #define br_warn(__br, format, args...) \ 433 br_printk(KERN_WARNING, __br, format, ##args) 434 #define br_notice(__br, format, args...) \ 435 br_printk(KERN_NOTICE, __br, format, ##args) 436 #define br_info(__br, format, args...) \ 437 br_printk(KERN_INFO, __br, format, ##args) 438 439 #define br_debug(br, format, args...) \ 440 pr_debug("%s: " format, (br)->dev->name, ##args) 441 442 /* called under bridge lock */ 443 static inline int br_is_root_bridge(const struct net_bridge *br) 444 { 445 return !memcmp(&br->bridge_id, &br->designated_root, 8); 446 } 447 448 /* check if a VLAN entry is global */ 449 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 450 { 451 return v->flags & BRIDGE_VLAN_INFO_MASTER; 452 } 453 454 /* check if a VLAN entry is used by the bridge */ 455 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 456 { 457 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 458 } 459 460 /* check if we should use the vlan entry, returns false if it's only context */ 461 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 462 { 463 if (br_vlan_is_master(v)) { 464 if (br_vlan_is_brentry(v)) 465 return true; 466 else 467 return false; 468 } 469 470 return true; 471 } 472 473 /* br_device.c */ 474 void br_dev_setup(struct net_device *dev); 475 void br_dev_delete(struct net_device *dev, struct list_head *list); 476 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 477 #ifdef CONFIG_NET_POLL_CONTROLLER 478 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 479 struct sk_buff *skb) 480 { 481 struct netpoll *np = p->np; 482 483 if (np) 484 netpoll_send_skb(np, skb); 485 } 486 487 int br_netpoll_enable(struct net_bridge_port *p); 488 void br_netpoll_disable(struct net_bridge_port *p); 489 #else 490 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 491 struct sk_buff *skb) 492 { 493 } 494 495 static inline int br_netpoll_enable(struct net_bridge_port *p) 496 { 497 return 0; 498 } 499 500 static inline void br_netpoll_disable(struct net_bridge_port *p) 501 { 502 } 503 #endif 504 505 /* br_fdb.c */ 506 int br_fdb_init(void); 507 void br_fdb_fini(void); 508 void br_fdb_flush(struct net_bridge *br); 509 void br_fdb_find_delete_local(struct net_bridge *br, 510 const struct net_bridge_port *p, 511 const unsigned char *addr, u16 vid); 512 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 513 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 514 void br_fdb_cleanup(struct work_struct *work); 515 void br_fdb_delete_by_port(struct net_bridge *br, 516 const struct net_bridge_port *p, u16 vid, int do_all); 517 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 518 const unsigned char *addr, 519 __u16 vid); 520 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 521 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 522 unsigned long off); 523 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 524 const unsigned char *addr, u16 vid); 525 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 526 const unsigned char *addr, u16 vid, bool added_by_user); 527 528 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 529 struct net_device *dev, const unsigned char *addr, u16 vid); 530 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 531 const unsigned char *addr, u16 vid, u16 nlh_flags); 532 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 533 struct net_device *dev, struct net_device *fdev, int *idx); 534 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 535 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 536 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 537 const unsigned char *addr, u16 vid); 538 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 539 const unsigned char *addr, u16 vid); 540 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 541 const unsigned char *addr, u16 vid); 542 543 /* br_forward.c */ 544 enum br_pkt_type { 545 BR_PKT_UNICAST, 546 BR_PKT_MULTICAST, 547 BR_PKT_BROADCAST 548 }; 549 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 550 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 551 bool local_rcv, bool local_orig); 552 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 553 void br_flood(struct net_bridge *br, struct sk_buff *skb, 554 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 555 556 /* br_if.c */ 557 void br_port_carrier_check(struct net_bridge_port *p); 558 int br_add_bridge(struct net *net, const char *name); 559 int br_del_bridge(struct net *net, const char *name); 560 int br_add_if(struct net_bridge *br, struct net_device *dev); 561 int br_del_if(struct net_bridge *br, struct net_device *dev); 562 int br_min_mtu(const struct net_bridge *br); 563 netdev_features_t br_features_recompute(struct net_bridge *br, 564 netdev_features_t features); 565 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 566 void br_manage_promisc(struct net_bridge *br); 567 568 /* br_input.c */ 569 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 570 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 571 572 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 573 { 574 return rcu_dereference(dev->rx_handler) == br_handle_frame; 575 } 576 577 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 578 { 579 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 580 } 581 582 /* br_ioctl.c */ 583 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 584 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 585 void __user *arg); 586 587 /* br_multicast.c */ 588 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 589 extern unsigned int br_mdb_rehash_seq; 590 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 591 struct sk_buff *skb, u16 vid); 592 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 593 struct sk_buff *skb, u16 vid); 594 int br_multicast_add_port(struct net_bridge_port *port); 595 void br_multicast_del_port(struct net_bridge_port *port); 596 void br_multicast_enable_port(struct net_bridge_port *port); 597 void br_multicast_disable_port(struct net_bridge_port *port); 598 void br_multicast_init(struct net_bridge *br); 599 void br_multicast_open(struct net_bridge *br); 600 void br_multicast_stop(struct net_bridge *br); 601 void br_multicast_dev_del(struct net_bridge *br); 602 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 603 struct sk_buff *skb, bool local_rcv, bool local_orig); 604 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 605 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 606 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 607 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 608 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 609 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 610 #if IS_ENABLED(CONFIG_IPV6) 611 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 612 #endif 613 struct net_bridge_mdb_entry * 614 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 615 struct net_bridge_mdb_entry * 616 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 617 struct br_ip *group); 618 void br_multicast_free_pg(struct rcu_head *head); 619 struct net_bridge_port_group * 620 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 621 struct net_bridge_port_group __rcu *next, 622 unsigned char flags, const unsigned char *src); 623 void br_mdb_init(void); 624 void br_mdb_uninit(void); 625 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 626 struct br_ip *group, int type, u8 flags); 627 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 628 int type); 629 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 630 const struct sk_buff *skb, u8 type, u8 dir); 631 int br_multicast_init_stats(struct net_bridge *br); 632 void br_multicast_uninit_stats(struct net_bridge *br); 633 void br_multicast_get_stats(const struct net_bridge *br, 634 const struct net_bridge_port *p, 635 struct br_mcast_stats *dest); 636 637 #define mlock_dereference(X, br) \ 638 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 639 640 static inline bool br_multicast_is_router(struct net_bridge *br) 641 { 642 return br->multicast_router == 2 || 643 (br->multicast_router == 1 && 644 timer_pending(&br->multicast_router_timer)); 645 } 646 647 static inline bool 648 __br_multicast_querier_exists(struct net_bridge *br, 649 struct bridge_mcast_other_query *querier, 650 const bool is_ipv6) 651 { 652 bool own_querier_enabled; 653 654 if (br->multicast_querier) { 655 if (is_ipv6 && !br->has_ipv6_addr) 656 own_querier_enabled = false; 657 else 658 own_querier_enabled = true; 659 } else { 660 own_querier_enabled = false; 661 } 662 663 return time_is_before_jiffies(querier->delay_time) && 664 (own_querier_enabled || timer_pending(&querier->timer)); 665 } 666 667 static inline bool br_multicast_querier_exists(struct net_bridge *br, 668 struct ethhdr *eth) 669 { 670 switch (eth->h_proto) { 671 case (htons(ETH_P_IP)): 672 return __br_multicast_querier_exists(br, 673 &br->ip4_other_query, false); 674 #if IS_ENABLED(CONFIG_IPV6) 675 case (htons(ETH_P_IPV6)): 676 return __br_multicast_querier_exists(br, 677 &br->ip6_other_query, true); 678 #endif 679 default: 680 return false; 681 } 682 } 683 684 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 685 { 686 return BR_INPUT_SKB_CB(skb)->igmp; 687 } 688 #else 689 static inline int br_multicast_rcv(struct net_bridge *br, 690 struct net_bridge_port *port, 691 struct sk_buff *skb, 692 u16 vid) 693 { 694 return 0; 695 } 696 697 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 698 struct sk_buff *skb, u16 vid) 699 { 700 return NULL; 701 } 702 703 static inline int br_multicast_add_port(struct net_bridge_port *port) 704 { 705 return 0; 706 } 707 708 static inline void br_multicast_del_port(struct net_bridge_port *port) 709 { 710 } 711 712 static inline void br_multicast_enable_port(struct net_bridge_port *port) 713 { 714 } 715 716 static inline void br_multicast_disable_port(struct net_bridge_port *port) 717 { 718 } 719 720 static inline void br_multicast_init(struct net_bridge *br) 721 { 722 } 723 724 static inline void br_multicast_open(struct net_bridge *br) 725 { 726 } 727 728 static inline void br_multicast_stop(struct net_bridge *br) 729 { 730 } 731 732 static inline void br_multicast_dev_del(struct net_bridge *br) 733 { 734 } 735 736 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 737 struct sk_buff *skb, 738 bool local_rcv, bool local_orig) 739 { 740 } 741 742 static inline bool br_multicast_is_router(struct net_bridge *br) 743 { 744 return 0; 745 } 746 747 static inline bool br_multicast_querier_exists(struct net_bridge *br, 748 struct ethhdr *eth) 749 { 750 return false; 751 } 752 753 static inline void br_mdb_init(void) 754 { 755 } 756 757 static inline void br_mdb_uninit(void) 758 { 759 } 760 761 static inline void br_multicast_count(struct net_bridge *br, 762 const struct net_bridge_port *p, 763 const struct sk_buff *skb, 764 u8 type, u8 dir) 765 { 766 } 767 768 static inline int br_multicast_init_stats(struct net_bridge *br) 769 { 770 return 0; 771 } 772 773 static inline void br_multicast_uninit_stats(struct net_bridge *br) 774 { 775 } 776 777 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 778 { 779 return 0; 780 } 781 #endif 782 783 /* br_vlan.c */ 784 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 785 bool br_allowed_ingress(const struct net_bridge *br, 786 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 787 u16 *vid); 788 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 789 const struct sk_buff *skb); 790 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 791 struct sk_buff *br_handle_vlan(struct net_bridge *br, 792 const struct net_bridge_port *port, 793 struct net_bridge_vlan_group *vg, 794 struct sk_buff *skb); 795 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags); 796 int br_vlan_delete(struct net_bridge *br, u16 vid); 797 void br_vlan_flush(struct net_bridge *br); 798 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 799 void br_recalculate_fwd_mask(struct net_bridge *br); 800 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 801 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 802 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 803 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 804 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 805 int br_vlan_init(struct net_bridge *br); 806 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 807 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 808 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags); 809 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 810 void nbp_vlan_flush(struct net_bridge_port *port); 811 int nbp_vlan_init(struct net_bridge_port *port); 812 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 813 void br_vlan_get_stats(const struct net_bridge_vlan *v, 814 struct br_vlan_stats *stats); 815 816 static inline struct net_bridge_vlan_group *br_vlan_group( 817 const struct net_bridge *br) 818 { 819 return rtnl_dereference(br->vlgrp); 820 } 821 822 static inline struct net_bridge_vlan_group *nbp_vlan_group( 823 const struct net_bridge_port *p) 824 { 825 return rtnl_dereference(p->vlgrp); 826 } 827 828 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 829 const struct net_bridge *br) 830 { 831 return rcu_dereference(br->vlgrp); 832 } 833 834 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 835 const struct net_bridge_port *p) 836 { 837 return rcu_dereference(p->vlgrp); 838 } 839 840 /* Since bridge now depends on 8021Q module, but the time bridge sees the 841 * skb, the vlan tag will always be present if the frame was tagged. 842 */ 843 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 844 { 845 int err = 0; 846 847 if (skb_vlan_tag_present(skb)) { 848 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 849 } else { 850 *vid = 0; 851 err = -EINVAL; 852 } 853 854 return err; 855 } 856 857 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 858 { 859 if (!vg) 860 return 0; 861 862 smp_rmb(); 863 return vg->pvid; 864 } 865 866 #else 867 static inline bool br_allowed_ingress(const struct net_bridge *br, 868 struct net_bridge_vlan_group *vg, 869 struct sk_buff *skb, 870 u16 *vid) 871 { 872 return true; 873 } 874 875 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 876 const struct sk_buff *skb) 877 { 878 return true; 879 } 880 881 static inline bool br_should_learn(struct net_bridge_port *p, 882 struct sk_buff *skb, u16 *vid) 883 { 884 return true; 885 } 886 887 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 888 const struct net_bridge_port *port, 889 struct net_bridge_vlan_group *vg, 890 struct sk_buff *skb) 891 { 892 return skb; 893 } 894 895 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) 896 { 897 return -EOPNOTSUPP; 898 } 899 900 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 901 { 902 return -EOPNOTSUPP; 903 } 904 905 static inline void br_vlan_flush(struct net_bridge *br) 906 { 907 } 908 909 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 910 { 911 } 912 913 static inline int br_vlan_init(struct net_bridge *br) 914 { 915 return 0; 916 } 917 918 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) 919 { 920 return -EOPNOTSUPP; 921 } 922 923 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 924 { 925 return -EOPNOTSUPP; 926 } 927 928 static inline void nbp_vlan_flush(struct net_bridge_port *port) 929 { 930 } 931 932 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 933 u16 vid) 934 { 935 return NULL; 936 } 937 938 static inline int nbp_vlan_init(struct net_bridge_port *port) 939 { 940 return 0; 941 } 942 943 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 944 { 945 return 0; 946 } 947 948 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 949 { 950 return 0; 951 } 952 953 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 954 unsigned long val) 955 { 956 return -EOPNOTSUPP; 957 } 958 959 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 960 u32 filter_mask) 961 { 962 return 0; 963 } 964 965 static inline struct net_bridge_vlan_group *br_vlan_group( 966 const struct net_bridge *br) 967 { 968 return NULL; 969 } 970 971 static inline struct net_bridge_vlan_group *nbp_vlan_group( 972 const struct net_bridge_port *p) 973 { 974 return NULL; 975 } 976 977 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 978 const struct net_bridge *br) 979 { 980 return NULL; 981 } 982 983 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 984 const struct net_bridge_port *p) 985 { 986 return NULL; 987 } 988 989 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 990 struct br_vlan_stats *stats) 991 { 992 } 993 #endif 994 995 struct nf_br_ops { 996 int (*br_dev_xmit_hook)(struct sk_buff *skb); 997 }; 998 extern const struct nf_br_ops __rcu *nf_br_ops; 999 1000 /* br_netfilter.c */ 1001 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1002 int br_nf_core_init(void); 1003 void br_nf_core_fini(void); 1004 void br_netfilter_rtable_init(struct net_bridge *); 1005 #else 1006 static inline int br_nf_core_init(void) { return 0; } 1007 static inline void br_nf_core_fini(void) {} 1008 #define br_netfilter_rtable_init(x) 1009 #endif 1010 1011 /* br_stp.c */ 1012 void br_set_state(struct net_bridge_port *p, unsigned int state); 1013 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1014 void br_init_port(struct net_bridge_port *p); 1015 void br_become_designated_port(struct net_bridge_port *p); 1016 1017 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1018 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1019 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1020 int br_set_max_age(struct net_bridge *br, unsigned long x); 1021 int __set_ageing_time(struct net_device *dev, unsigned long t); 1022 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1023 1024 1025 /* br_stp_if.c */ 1026 void br_stp_enable_bridge(struct net_bridge *br); 1027 void br_stp_disable_bridge(struct net_bridge *br); 1028 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1029 void br_stp_enable_port(struct net_bridge_port *p); 1030 void br_stp_disable_port(struct net_bridge_port *p); 1031 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1032 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1033 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1034 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1035 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1036 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1037 1038 /* br_stp_bpdu.c */ 1039 struct stp_proto; 1040 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1041 struct net_device *dev); 1042 1043 /* br_stp_timer.c */ 1044 void br_stp_timer_init(struct net_bridge *br); 1045 void br_stp_port_timer_init(struct net_bridge_port *p); 1046 unsigned long br_timer_value(const struct timer_list *timer); 1047 1048 /* br.c */ 1049 #if IS_ENABLED(CONFIG_ATM_LANE) 1050 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1051 #endif 1052 1053 /* br_netlink.c */ 1054 extern struct rtnl_link_ops br_link_ops; 1055 int br_netlink_init(void); 1056 void br_netlink_fini(void); 1057 void br_ifinfo_notify(int event, struct net_bridge_port *port); 1058 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1059 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1060 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1061 u32 filter_mask, int nlflags); 1062 1063 #ifdef CONFIG_SYSFS 1064 /* br_sysfs_if.c */ 1065 extern const struct sysfs_ops brport_sysfs_ops; 1066 int br_sysfs_addif(struct net_bridge_port *p); 1067 int br_sysfs_renameif(struct net_bridge_port *p); 1068 1069 /* br_sysfs_br.c */ 1070 int br_sysfs_addbr(struct net_device *dev); 1071 void br_sysfs_delbr(struct net_device *dev); 1072 1073 #else 1074 1075 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1076 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1077 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1078 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1079 #endif /* CONFIG_SYSFS */ 1080 1081 /* br_switchdev.c */ 1082 #ifdef CONFIG_NET_SWITCHDEV 1083 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1084 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1085 struct sk_buff *skb); 1086 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1087 const struct sk_buff *skb); 1088 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1089 unsigned long flags, 1090 unsigned long mask); 1091 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1092 int type); 1093 #else 1094 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1095 { 1096 return 0; 1097 } 1098 1099 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1100 struct sk_buff *skb) 1101 { 1102 } 1103 1104 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1105 const struct sk_buff *skb) 1106 { 1107 return true; 1108 } 1109 1110 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1111 unsigned long flags, 1112 unsigned long mask) 1113 { 1114 return 0; 1115 } 1116 1117 static inline void 1118 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1119 { 1120 } 1121 #endif /* CONFIG_NET_SWITCHDEV */ 1122 1123 #endif 1124