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