1 /* 2 * Linux ethernet bridge 3 * 4 * Authors: 5 * Lennert Buytenhek <buytenh@gnu.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #ifndef _BR_PRIVATE_H 14 #define _BR_PRIVATE_H 15 16 #include <linux/netdevice.h> 17 #include <linux/if_bridge.h> 18 #include <linux/netpoll.h> 19 #include <linux/u64_stats_sync.h> 20 #include <net/route.h> 21 #include <net/ip6_fib.h> 22 #include <linux/if_vlan.h> 23 #include <linux/rhashtable.h> 24 #include <linux/refcount.h> 25 26 #define BR_HASH_BITS 8 27 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 28 29 #define BR_HOLD_TIME (1*HZ) 30 31 #define BR_PORT_BITS 10 32 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 33 34 #define BR_VERSION "2.3" 35 36 /* Control of forwarding link local multicast */ 37 #define BR_GROUPFWD_DEFAULT 0 38 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 39 enum { 40 BR_GROUPFWD_STP = BIT(0), 41 BR_GROUPFWD_MACPAUSE = BIT(1), 42 BR_GROUPFWD_LACP = BIT(2), 43 }; 44 45 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 46 BR_GROUPFWD_LACP) 47 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 48 #define BR_GROUPFWD_8021AD 0xB801u 49 50 /* Path to usermode spanning tree program */ 51 #define BR_STP_PROG "/sbin/bridge-stp" 52 53 typedef struct bridge_id bridge_id; 54 typedef struct mac_addr mac_addr; 55 typedef __u16 port_id; 56 57 struct bridge_id 58 { 59 unsigned char prio[2]; 60 unsigned char addr[ETH_ALEN]; 61 }; 62 63 struct mac_addr 64 { 65 unsigned char addr[ETH_ALEN]; 66 }; 67 68 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 69 /* our own querier */ 70 struct bridge_mcast_own_query { 71 struct timer_list timer; 72 u32 startup_sent; 73 }; 74 75 /* other querier */ 76 struct bridge_mcast_other_query { 77 struct timer_list timer; 78 unsigned long delay_time; 79 }; 80 81 /* selected querier */ 82 struct bridge_mcast_querier { 83 struct br_ip addr; 84 struct net_bridge_port __rcu *port; 85 }; 86 87 /* IGMP/MLD statistics */ 88 struct bridge_mcast_stats { 89 struct br_mcast_stats mstats; 90 struct u64_stats_sync syncp; 91 }; 92 #endif 93 94 struct br_vlan_stats { 95 u64 rx_bytes; 96 u64 rx_packets; 97 u64 tx_bytes; 98 u64 tx_packets; 99 struct u64_stats_sync syncp; 100 }; 101 102 struct br_tunnel_info { 103 __be64 tunnel_id; 104 struct metadata_dst *tunnel_dst; 105 }; 106 107 /** 108 * struct net_bridge_vlan - per-vlan entry 109 * 110 * @vnode: rhashtable member 111 * @vid: VLAN id 112 * @flags: bridge vlan flags 113 * @stats: per-cpu VLAN statistics 114 * @br: if MASTER flag set, this points to a bridge struct 115 * @port: if MASTER flag unset, this points to a port struct 116 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 117 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 118 * for this VLAN entry 119 * @vlist: sorted list of VLAN entries 120 * @rcu: used for entry destruction 121 * 122 * This structure is shared between the global per-VLAN entries contained in 123 * the bridge rhashtable and the local per-port per-VLAN entries contained in 124 * the port's rhashtable. The union entries should be interpreted depending on 125 * the entry flags that are set. 126 */ 127 struct net_bridge_vlan { 128 struct rhash_head vnode; 129 struct rhash_head tnode; 130 u16 vid; 131 u16 flags; 132 struct br_vlan_stats __percpu *stats; 133 union { 134 struct net_bridge *br; 135 struct net_bridge_port *port; 136 }; 137 union { 138 refcount_t refcnt; 139 struct net_bridge_vlan *brvlan; 140 }; 141 142 struct br_tunnel_info tinfo; 143 144 struct list_head vlist; 145 146 struct rcu_head rcu; 147 }; 148 149 /** 150 * struct net_bridge_vlan_group 151 * 152 * @vlan_hash: VLAN entry rhashtable 153 * @vlan_list: sorted VLAN entry list 154 * @num_vlans: number of total VLAN entries 155 * @pvid: PVID VLAN id 156 * 157 * IMPORTANT: Be careful when checking if there're VLAN entries using list 158 * primitives because the bridge can have entries in its list which 159 * are just for global context but not for filtering, i.e. they have 160 * the master flag set but not the brentry flag. If you have to check 161 * if there're "real" entries in the bridge please test @num_vlans 162 */ 163 struct net_bridge_vlan_group { 164 struct rhashtable vlan_hash; 165 struct rhashtable tunnel_hash; 166 struct list_head vlan_list; 167 u16 num_vlans; 168 u16 pvid; 169 }; 170 171 struct net_bridge_fdb_key { 172 mac_addr addr; 173 u16 vlan_id; 174 }; 175 176 struct net_bridge_fdb_entry { 177 struct rhash_head rhnode; 178 struct net_bridge_port *dst; 179 180 struct net_bridge_fdb_key key; 181 struct hlist_node fdb_node; 182 unsigned char is_local:1, 183 is_static:1, 184 added_by_user:1, 185 added_by_external_learn:1, 186 offloaded:1; 187 188 /* write-heavy members should not affect lookups */ 189 unsigned long updated ____cacheline_aligned_in_smp; 190 unsigned long used; 191 192 struct rcu_head rcu; 193 }; 194 195 #define MDB_PG_FLAGS_PERMANENT BIT(0) 196 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 197 198 struct net_bridge_port_group { 199 struct net_bridge_port *port; 200 struct net_bridge_port_group __rcu *next; 201 struct hlist_node mglist; 202 struct rcu_head rcu; 203 struct timer_list timer; 204 struct br_ip addr; 205 unsigned char flags; 206 unsigned char eth_addr[ETH_ALEN]; 207 }; 208 209 struct net_bridge_mdb_entry 210 { 211 struct hlist_node hlist[2]; 212 struct net_bridge *br; 213 struct net_bridge_port_group __rcu *ports; 214 struct rcu_head rcu; 215 struct timer_list timer; 216 struct br_ip addr; 217 bool host_joined; 218 }; 219 220 struct net_bridge_mdb_htable 221 { 222 struct hlist_head *mhash; 223 struct rcu_head rcu; 224 struct net_bridge_mdb_htable *old; 225 u32 size; 226 u32 max; 227 u32 secret; 228 u32 ver; 229 }; 230 231 struct net_bridge_port { 232 struct net_bridge *br; 233 struct net_device *dev; 234 struct list_head list; 235 236 unsigned long flags; 237 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 238 struct net_bridge_vlan_group __rcu *vlgrp; 239 #endif 240 241 /* STP */ 242 u8 priority; 243 u8 state; 244 u16 port_no; 245 unsigned char topology_change_ack; 246 unsigned char config_pending; 247 port_id port_id; 248 port_id designated_port; 249 bridge_id designated_root; 250 bridge_id designated_bridge; 251 u32 path_cost; 252 u32 designated_cost; 253 unsigned long designated_age; 254 255 struct timer_list forward_delay_timer; 256 struct timer_list hold_timer; 257 struct timer_list message_age_timer; 258 struct kobject kobj; 259 struct rcu_head rcu; 260 261 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 262 struct bridge_mcast_own_query ip4_own_query; 263 #if IS_ENABLED(CONFIG_IPV6) 264 struct bridge_mcast_own_query ip6_own_query; 265 #endif /* IS_ENABLED(CONFIG_IPV6) */ 266 unsigned char multicast_router; 267 struct bridge_mcast_stats __percpu *mcast_stats; 268 struct timer_list multicast_router_timer; 269 struct hlist_head mglist; 270 struct hlist_node rlist; 271 #endif 272 273 #ifdef CONFIG_SYSFS 274 char sysfs_name[IFNAMSIZ]; 275 #endif 276 277 #ifdef CONFIG_NET_POLL_CONTROLLER 278 struct netpoll *np; 279 #endif 280 #ifdef CONFIG_NET_SWITCHDEV 281 int offload_fwd_mark; 282 #endif 283 u16 group_fwd_mask; 284 }; 285 286 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 287 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 288 289 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) 290 291 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 292 { 293 return rcu_dereference(dev->rx_handler_data); 294 } 295 296 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 297 { 298 return br_port_exists(dev) ? 299 rtnl_dereference(dev->rx_handler_data) : NULL; 300 } 301 302 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 303 { 304 return br_port_exists(dev) ? 305 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 306 } 307 308 struct net_bridge { 309 spinlock_t lock; 310 spinlock_t hash_lock; 311 struct list_head port_list; 312 struct net_device *dev; 313 struct pcpu_sw_netstats __percpu *stats; 314 /* These fields are accessed on each packet */ 315 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 316 u8 vlan_enabled; 317 u8 vlan_stats_enabled; 318 __be16 vlan_proto; 319 u16 default_pvid; 320 struct net_bridge_vlan_group __rcu *vlgrp; 321 #endif 322 323 struct rhashtable fdb_hash_tbl; 324 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 325 union { 326 struct rtable fake_rtable; 327 struct rt6_info fake_rt6_info; 328 }; 329 bool nf_call_iptables; 330 bool nf_call_ip6tables; 331 bool nf_call_arptables; 332 #endif 333 u16 group_fwd_mask; 334 u16 group_fwd_mask_required; 335 336 /* STP */ 337 bridge_id designated_root; 338 bridge_id bridge_id; 339 u32 root_path_cost; 340 unsigned char topology_change; 341 unsigned char topology_change_detected; 342 u16 root_port; 343 unsigned long max_age; 344 unsigned long hello_time; 345 unsigned long forward_delay; 346 unsigned long ageing_time; 347 unsigned long bridge_max_age; 348 unsigned long bridge_hello_time; 349 unsigned long bridge_forward_delay; 350 unsigned long bridge_ageing_time; 351 352 u8 group_addr[ETH_ALEN]; 353 bool group_addr_set; 354 355 enum { 356 BR_NO_STP, /* no spanning tree */ 357 BR_KERNEL_STP, /* old STP in kernel */ 358 BR_USER_STP, /* new RSTP in userspace */ 359 } stp_enabled; 360 361 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 362 unsigned char multicast_router; 363 364 u8 multicast_disabled:1; 365 u8 multicast_querier:1; 366 u8 multicast_query_use_ifaddr:1; 367 u8 has_ipv6_addr:1; 368 u8 multicast_stats_enabled:1; 369 370 u32 hash_elasticity; 371 u32 hash_max; 372 373 u32 multicast_last_member_count; 374 u32 multicast_startup_query_count; 375 376 u8 multicast_igmp_version; 377 378 unsigned long multicast_last_member_interval; 379 unsigned long multicast_membership_interval; 380 unsigned long multicast_querier_interval; 381 unsigned long multicast_query_interval; 382 unsigned long multicast_query_response_interval; 383 unsigned long multicast_startup_query_interval; 384 385 spinlock_t multicast_lock; 386 struct net_bridge_mdb_htable __rcu *mdb; 387 struct hlist_head router_list; 388 389 struct timer_list multicast_router_timer; 390 struct bridge_mcast_other_query ip4_other_query; 391 struct bridge_mcast_own_query ip4_own_query; 392 struct bridge_mcast_querier ip4_querier; 393 struct bridge_mcast_stats __percpu *mcast_stats; 394 #if IS_ENABLED(CONFIG_IPV6) 395 struct bridge_mcast_other_query ip6_other_query; 396 struct bridge_mcast_own_query ip6_own_query; 397 struct bridge_mcast_querier ip6_querier; 398 u8 multicast_mld_version; 399 #endif /* IS_ENABLED(CONFIG_IPV6) */ 400 #endif 401 402 struct timer_list hello_timer; 403 struct timer_list tcn_timer; 404 struct timer_list topology_change_timer; 405 struct delayed_work gc_work; 406 struct kobject *ifobj; 407 u32 auto_cnt; 408 409 #ifdef CONFIG_NET_SWITCHDEV 410 int offload_fwd_mark; 411 #endif 412 bool neigh_suppress_enabled; 413 bool mtu_set_by_user; 414 struct hlist_head fdb_list; 415 }; 416 417 struct br_input_skb_cb { 418 struct net_device *brdev; 419 420 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 421 int igmp; 422 int mrouters_only; 423 #endif 424 425 bool proxyarp_replied; 426 427 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 428 bool vlan_filtered; 429 #endif 430 431 #ifdef CONFIG_NET_SWITCHDEV 432 int offload_fwd_mark; 433 #endif 434 }; 435 436 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 437 438 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 439 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 440 #else 441 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 442 #endif 443 444 #define br_printk(level, br, format, args...) \ 445 printk(level "%s: " format, (br)->dev->name, ##args) 446 447 #define br_err(__br, format, args...) \ 448 br_printk(KERN_ERR, __br, format, ##args) 449 #define br_warn(__br, format, args...) \ 450 br_printk(KERN_WARNING, __br, format, ##args) 451 #define br_notice(__br, format, args...) \ 452 br_printk(KERN_NOTICE, __br, format, ##args) 453 #define br_info(__br, format, args...) \ 454 br_printk(KERN_INFO, __br, format, ##args) 455 456 #define br_debug(br, format, args...) \ 457 pr_debug("%s: " format, (br)->dev->name, ##args) 458 459 /* called under bridge lock */ 460 static inline int br_is_root_bridge(const struct net_bridge *br) 461 { 462 return !memcmp(&br->bridge_id, &br->designated_root, 8); 463 } 464 465 /* check if a VLAN entry is global */ 466 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 467 { 468 return v->flags & BRIDGE_VLAN_INFO_MASTER; 469 } 470 471 /* check if a VLAN entry is used by the bridge */ 472 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 473 { 474 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 475 } 476 477 /* check if we should use the vlan entry, returns false if it's only context */ 478 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 479 { 480 if (br_vlan_is_master(v)) { 481 if (br_vlan_is_brentry(v)) 482 return true; 483 else 484 return false; 485 } 486 487 return true; 488 } 489 490 /* br_device.c */ 491 void br_dev_setup(struct net_device *dev); 492 void br_dev_delete(struct net_device *dev, struct list_head *list); 493 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 494 #ifdef CONFIG_NET_POLL_CONTROLLER 495 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 496 struct sk_buff *skb) 497 { 498 struct netpoll *np = p->np; 499 500 if (np) 501 netpoll_send_skb(np, skb); 502 } 503 504 int br_netpoll_enable(struct net_bridge_port *p); 505 void br_netpoll_disable(struct net_bridge_port *p); 506 #else 507 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 508 struct sk_buff *skb) 509 { 510 } 511 512 static inline int br_netpoll_enable(struct net_bridge_port *p) 513 { 514 return 0; 515 } 516 517 static inline void br_netpoll_disable(struct net_bridge_port *p) 518 { 519 } 520 #endif 521 522 /* br_fdb.c */ 523 int br_fdb_init(void); 524 void br_fdb_fini(void); 525 int br_fdb_hash_init(struct net_bridge *br); 526 void br_fdb_hash_fini(struct net_bridge *br); 527 void br_fdb_flush(struct net_bridge *br); 528 void br_fdb_find_delete_local(struct net_bridge *br, 529 const struct net_bridge_port *p, 530 const unsigned char *addr, u16 vid); 531 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 532 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 533 void br_fdb_cleanup(struct work_struct *work); 534 void br_fdb_delete_by_port(struct net_bridge *br, 535 const struct net_bridge_port *p, u16 vid, int do_all); 536 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 537 const unsigned char *addr, 538 __u16 vid); 539 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 540 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 541 unsigned long off); 542 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 543 const unsigned char *addr, u16 vid); 544 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 545 const unsigned char *addr, u16 vid, bool added_by_user); 546 547 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 548 struct net_device *dev, const unsigned char *addr, u16 vid); 549 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 550 const unsigned char *addr, u16 vid, u16 nlh_flags); 551 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 552 struct net_device *dev, struct net_device *fdev, int *idx); 553 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 554 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 555 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 556 const unsigned char *addr, u16 vid); 557 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 558 const unsigned char *addr, u16 vid); 559 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 560 const unsigned char *addr, u16 vid); 561 562 /* br_forward.c */ 563 enum br_pkt_type { 564 BR_PKT_UNICAST, 565 BR_PKT_MULTICAST, 566 BR_PKT_BROADCAST 567 }; 568 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 569 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 570 bool local_rcv, bool local_orig); 571 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 572 void br_flood(struct net_bridge *br, struct sk_buff *skb, 573 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 574 575 /* br_if.c */ 576 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 577 int br_add_bridge(struct net *net, const char *name); 578 int br_del_bridge(struct net *net, const char *name); 579 int br_add_if(struct net_bridge *br, struct net_device *dev, 580 struct netlink_ext_ack *extack); 581 int br_del_if(struct net_bridge *br, struct net_device *dev); 582 void br_mtu_auto_adjust(struct net_bridge *br); 583 netdev_features_t br_features_recompute(struct net_bridge *br, 584 netdev_features_t features); 585 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 586 void br_manage_promisc(struct net_bridge *br); 587 588 /* br_input.c */ 589 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 590 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 591 592 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 593 { 594 return rcu_dereference(dev->rx_handler) == br_handle_frame; 595 } 596 597 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 598 { 599 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 600 } 601 602 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 603 { 604 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 605 } 606 607 static inline struct net_bridge_port * 608 br_port_get_check_rtnl(const struct net_device *dev) 609 { 610 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 611 } 612 613 /* br_ioctl.c */ 614 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 615 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 616 void __user *arg); 617 618 /* br_multicast.c */ 619 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 620 extern unsigned int br_mdb_rehash_seq; 621 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 622 struct sk_buff *skb, u16 vid); 623 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 624 struct sk_buff *skb, u16 vid); 625 int br_multicast_add_port(struct net_bridge_port *port); 626 void br_multicast_del_port(struct net_bridge_port *port); 627 void br_multicast_enable_port(struct net_bridge_port *port); 628 void br_multicast_disable_port(struct net_bridge_port *port); 629 void br_multicast_init(struct net_bridge *br); 630 void br_multicast_open(struct net_bridge *br); 631 void br_multicast_stop(struct net_bridge *br); 632 void br_multicast_dev_del(struct net_bridge *br); 633 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 634 struct sk_buff *skb, bool local_rcv, bool local_orig); 635 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 636 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 637 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 638 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 639 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 640 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 641 #if IS_ENABLED(CONFIG_IPV6) 642 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 643 #endif 644 struct net_bridge_mdb_entry * 645 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); 646 struct net_bridge_mdb_entry * 647 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, 648 struct br_ip *group); 649 void br_multicast_free_pg(struct rcu_head *head); 650 struct net_bridge_port_group * 651 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 652 struct net_bridge_port_group __rcu *next, 653 unsigned char flags, const unsigned char *src); 654 void br_mdb_init(void); 655 void br_mdb_uninit(void); 656 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 657 struct br_ip *group, int type, u8 flags); 658 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 659 int type); 660 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 661 const struct sk_buff *skb, u8 type, u8 dir); 662 int br_multicast_init_stats(struct net_bridge *br); 663 void br_multicast_uninit_stats(struct net_bridge *br); 664 void br_multicast_get_stats(const struct net_bridge *br, 665 const struct net_bridge_port *p, 666 struct br_mcast_stats *dest); 667 668 #define mlock_dereference(X, br) \ 669 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 670 671 static inline bool br_multicast_is_router(struct net_bridge *br) 672 { 673 return br->multicast_router == 2 || 674 (br->multicast_router == 1 && 675 timer_pending(&br->multicast_router_timer)); 676 } 677 678 static inline bool 679 __br_multicast_querier_exists(struct net_bridge *br, 680 struct bridge_mcast_other_query *querier, 681 const bool is_ipv6) 682 { 683 bool own_querier_enabled; 684 685 if (br->multicast_querier) { 686 if (is_ipv6 && !br->has_ipv6_addr) 687 own_querier_enabled = false; 688 else 689 own_querier_enabled = true; 690 } else { 691 own_querier_enabled = false; 692 } 693 694 return time_is_before_jiffies(querier->delay_time) && 695 (own_querier_enabled || timer_pending(&querier->timer)); 696 } 697 698 static inline bool br_multicast_querier_exists(struct net_bridge *br, 699 struct ethhdr *eth) 700 { 701 switch (eth->h_proto) { 702 case (htons(ETH_P_IP)): 703 return __br_multicast_querier_exists(br, 704 &br->ip4_other_query, false); 705 #if IS_ENABLED(CONFIG_IPV6) 706 case (htons(ETH_P_IPV6)): 707 return __br_multicast_querier_exists(br, 708 &br->ip6_other_query, true); 709 #endif 710 default: 711 return false; 712 } 713 } 714 715 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 716 { 717 return BR_INPUT_SKB_CB(skb)->igmp; 718 } 719 #else 720 static inline int br_multicast_rcv(struct net_bridge *br, 721 struct net_bridge_port *port, 722 struct sk_buff *skb, 723 u16 vid) 724 { 725 return 0; 726 } 727 728 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 729 struct sk_buff *skb, u16 vid) 730 { 731 return NULL; 732 } 733 734 static inline int br_multicast_add_port(struct net_bridge_port *port) 735 { 736 return 0; 737 } 738 739 static inline void br_multicast_del_port(struct net_bridge_port *port) 740 { 741 } 742 743 static inline void br_multicast_enable_port(struct net_bridge_port *port) 744 { 745 } 746 747 static inline void br_multicast_disable_port(struct net_bridge_port *port) 748 { 749 } 750 751 static inline void br_multicast_init(struct net_bridge *br) 752 { 753 } 754 755 static inline void br_multicast_open(struct net_bridge *br) 756 { 757 } 758 759 static inline void br_multicast_stop(struct net_bridge *br) 760 { 761 } 762 763 static inline void br_multicast_dev_del(struct net_bridge *br) 764 { 765 } 766 767 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 768 struct sk_buff *skb, 769 bool local_rcv, bool local_orig) 770 { 771 } 772 773 static inline bool br_multicast_is_router(struct net_bridge *br) 774 { 775 return false; 776 } 777 778 static inline bool br_multicast_querier_exists(struct net_bridge *br, 779 struct ethhdr *eth) 780 { 781 return false; 782 } 783 784 static inline void br_mdb_init(void) 785 { 786 } 787 788 static inline void br_mdb_uninit(void) 789 { 790 } 791 792 static inline void br_multicast_count(struct net_bridge *br, 793 const struct net_bridge_port *p, 794 const struct sk_buff *skb, 795 u8 type, u8 dir) 796 { 797 } 798 799 static inline int br_multicast_init_stats(struct net_bridge *br) 800 { 801 return 0; 802 } 803 804 static inline void br_multicast_uninit_stats(struct net_bridge *br) 805 { 806 } 807 808 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 809 { 810 return 0; 811 } 812 #endif 813 814 /* br_vlan.c */ 815 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 816 bool br_allowed_ingress(const struct net_bridge *br, 817 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 818 u16 *vid); 819 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 820 const struct sk_buff *skb); 821 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 822 struct sk_buff *br_handle_vlan(struct net_bridge *br, 823 const struct net_bridge_port *port, 824 struct net_bridge_vlan_group *vg, 825 struct sk_buff *skb); 826 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 827 bool *changed); 828 int br_vlan_delete(struct net_bridge *br, u16 vid); 829 void br_vlan_flush(struct net_bridge *br); 830 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 831 void br_recalculate_fwd_mask(struct net_bridge *br); 832 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 833 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 834 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 835 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 836 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 837 int br_vlan_init(struct net_bridge *br); 838 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 839 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid); 840 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 841 bool *changed); 842 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 843 void nbp_vlan_flush(struct net_bridge_port *port); 844 int nbp_vlan_init(struct net_bridge_port *port); 845 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 846 void br_vlan_get_stats(const struct net_bridge_vlan *v, 847 struct br_vlan_stats *stats); 848 849 static inline struct net_bridge_vlan_group *br_vlan_group( 850 const struct net_bridge *br) 851 { 852 return rtnl_dereference(br->vlgrp); 853 } 854 855 static inline struct net_bridge_vlan_group *nbp_vlan_group( 856 const struct net_bridge_port *p) 857 { 858 return rtnl_dereference(p->vlgrp); 859 } 860 861 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 862 const struct net_bridge *br) 863 { 864 return rcu_dereference(br->vlgrp); 865 } 866 867 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 868 const struct net_bridge_port *p) 869 { 870 return rcu_dereference(p->vlgrp); 871 } 872 873 /* Since bridge now depends on 8021Q module, but the time bridge sees the 874 * skb, the vlan tag will always be present if the frame was tagged. 875 */ 876 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 877 { 878 int err = 0; 879 880 if (skb_vlan_tag_present(skb)) { 881 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK; 882 } else { 883 *vid = 0; 884 err = -EINVAL; 885 } 886 887 return err; 888 } 889 890 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 891 { 892 if (!vg) 893 return 0; 894 895 smp_rmb(); 896 return vg->pvid; 897 } 898 899 #else 900 static inline bool br_allowed_ingress(const struct net_bridge *br, 901 struct net_bridge_vlan_group *vg, 902 struct sk_buff *skb, 903 u16 *vid) 904 { 905 return true; 906 } 907 908 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 909 const struct sk_buff *skb) 910 { 911 return true; 912 } 913 914 static inline bool br_should_learn(struct net_bridge_port *p, 915 struct sk_buff *skb, u16 *vid) 916 { 917 return true; 918 } 919 920 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 921 const struct net_bridge_port *port, 922 struct net_bridge_vlan_group *vg, 923 struct sk_buff *skb) 924 { 925 return skb; 926 } 927 928 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 929 bool *changed) 930 { 931 *changed = false; 932 return -EOPNOTSUPP; 933 } 934 935 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 936 { 937 return -EOPNOTSUPP; 938 } 939 940 static inline void br_vlan_flush(struct net_bridge *br) 941 { 942 } 943 944 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 945 { 946 } 947 948 static inline int br_vlan_init(struct net_bridge *br) 949 { 950 return 0; 951 } 952 953 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 954 bool *changed) 955 { 956 *changed = false; 957 return -EOPNOTSUPP; 958 } 959 960 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 961 { 962 return -EOPNOTSUPP; 963 } 964 965 static inline void nbp_vlan_flush(struct net_bridge_port *port) 966 { 967 } 968 969 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 970 u16 vid) 971 { 972 return NULL; 973 } 974 975 static inline int nbp_vlan_init(struct net_bridge_port *port) 976 { 977 return 0; 978 } 979 980 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 981 { 982 return 0; 983 } 984 985 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 986 { 987 return 0; 988 } 989 990 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 991 unsigned long val) 992 { 993 return -EOPNOTSUPP; 994 } 995 996 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 997 u32 filter_mask) 998 { 999 return 0; 1000 } 1001 1002 static inline struct net_bridge_vlan_group *br_vlan_group( 1003 const struct net_bridge *br) 1004 { 1005 return NULL; 1006 } 1007 1008 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1009 const struct net_bridge_port *p) 1010 { 1011 return NULL; 1012 } 1013 1014 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1015 const struct net_bridge *br) 1016 { 1017 return NULL; 1018 } 1019 1020 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1021 const struct net_bridge_port *p) 1022 { 1023 return NULL; 1024 } 1025 1026 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1027 struct br_vlan_stats *stats) 1028 { 1029 } 1030 #endif 1031 1032 struct nf_br_ops { 1033 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1034 }; 1035 extern const struct nf_br_ops __rcu *nf_br_ops; 1036 1037 /* br_netfilter.c */ 1038 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1039 int br_nf_core_init(void); 1040 void br_nf_core_fini(void); 1041 void br_netfilter_rtable_init(struct net_bridge *); 1042 #else 1043 static inline int br_nf_core_init(void) { return 0; } 1044 static inline void br_nf_core_fini(void) {} 1045 #define br_netfilter_rtable_init(x) 1046 #endif 1047 1048 /* br_stp.c */ 1049 void br_set_state(struct net_bridge_port *p, unsigned int state); 1050 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1051 void br_init_port(struct net_bridge_port *p); 1052 void br_become_designated_port(struct net_bridge_port *p); 1053 1054 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1055 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1056 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1057 int br_set_max_age(struct net_bridge *br, unsigned long x); 1058 int __set_ageing_time(struct net_device *dev, unsigned long t); 1059 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1060 1061 1062 /* br_stp_if.c */ 1063 void br_stp_enable_bridge(struct net_bridge *br); 1064 void br_stp_disable_bridge(struct net_bridge *br); 1065 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1066 void br_stp_enable_port(struct net_bridge_port *p); 1067 void br_stp_disable_port(struct net_bridge_port *p); 1068 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1069 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1070 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1071 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1072 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1073 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1074 1075 /* br_stp_bpdu.c */ 1076 struct stp_proto; 1077 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1078 struct net_device *dev); 1079 1080 /* br_stp_timer.c */ 1081 void br_stp_timer_init(struct net_bridge *br); 1082 void br_stp_port_timer_init(struct net_bridge_port *p); 1083 unsigned long br_timer_value(const struct timer_list *timer); 1084 1085 /* br.c */ 1086 #if IS_ENABLED(CONFIG_ATM_LANE) 1087 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1088 #endif 1089 1090 /* br_netlink.c */ 1091 extern struct rtnl_link_ops br_link_ops; 1092 int br_netlink_init(void); 1093 void br_netlink_fini(void); 1094 void br_ifinfo_notify(int event, const struct net_bridge *br, 1095 const struct net_bridge_port *port); 1096 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1097 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1098 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1099 u32 filter_mask, int nlflags); 1100 1101 #ifdef CONFIG_SYSFS 1102 /* br_sysfs_if.c */ 1103 extern const struct sysfs_ops brport_sysfs_ops; 1104 int br_sysfs_addif(struct net_bridge_port *p); 1105 int br_sysfs_renameif(struct net_bridge_port *p); 1106 1107 /* br_sysfs_br.c */ 1108 int br_sysfs_addbr(struct net_device *dev); 1109 void br_sysfs_delbr(struct net_device *dev); 1110 1111 #else 1112 1113 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1114 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1115 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1116 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1117 #endif /* CONFIG_SYSFS */ 1118 1119 /* br_switchdev.c */ 1120 #ifdef CONFIG_NET_SWITCHDEV 1121 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1122 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1123 struct sk_buff *skb); 1124 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1125 const struct sk_buff *skb); 1126 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1127 unsigned long flags, 1128 unsigned long mask); 1129 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1130 int type); 1131 1132 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1133 { 1134 skb->offload_fwd_mark = 0; 1135 } 1136 #else 1137 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1138 { 1139 return 0; 1140 } 1141 1142 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1143 struct sk_buff *skb) 1144 { 1145 } 1146 1147 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1148 const struct sk_buff *skb) 1149 { 1150 return true; 1151 } 1152 1153 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1154 unsigned long flags, 1155 unsigned long mask) 1156 { 1157 return 0; 1158 } 1159 1160 static inline void 1161 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1162 { 1163 } 1164 1165 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1166 { 1167 } 1168 #endif /* CONFIG_NET_SWITCHDEV */ 1169 1170 /* br_arp_nd_proxy.c */ 1171 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1172 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1173 u16 vid, struct net_bridge_port *p); 1174 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1175 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1176 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1177 #endif 1178